# Dakota Gold Reports Positive Metallurgical Test Program Results Informing the Richmond Hill Pre-Feasibility Study Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130 Original source: https://www.newsfilecorp.com/release/313768/Dakota-Gold-Reports-Positive-Metallurgical-Test-Program-Results-Informing-the-Richmond-Hill-PreFeasibility-Study Publisher: newsfile Original announcement: 2026-09-10T20:30:00.000Z Analysis by Minestarters Atlas Atlas analysis published: Unknown date Atlas analysis updated: Unknown date - Company: Dakota Gold Corp. - Ticker: DC - Exchange: Unavailable - Region: South Dakota - Primary commodity: Gold - Secondary commodities: Silver - Document categories: Metallurgy - Extracted: 2026-09-10 21:09:19 UTC Narrative sentiment: 0.70 · Bullish ## Minestarters Atlas summary Dakota Gold Corp. announced positive metallurgical test results for its Richmond Hill Oxide Heap Leach Gold Project in South Dakota, supporting the ongoing Pre-Feasibility Study. Column leach tests on oxide material showed gold recoveries up to 92.0%, with an unweighted average of 74.2%, and no issues with preg-robbing or clay. Transition material showed lower gold recoveries, averaging 67.1%, and silver recoveries were generally lower and more variable across all material types. Reasoning: Dakota Gold reports positive metallurgical test results for its Richmond Hill project, confirming amenability to heap leaching with strong gold recoveries for oxide material \(up to 92.0%\). The PFS-level test program, conducted by a qualified person with robust QA/QC, indicates free-milling characteristics across multiple domains. While silver recoveries are more variable and lower, especially for transition material, the overall results support the project's advancement to a Pre-Feasibility Study. - Positive factor: High Gold Recovery - Positive factor: Pilot Scale Testwork - Positive factor: Free Milling Characteristics - Positive factor: Multi-Domain Testing - Positive factor: QP/CP Signed Report - Positive factor: Comprehensive QA/QC - Negative factor: Variable Silver Recovery - Negative factor: Lower Recoveries for Transition Material Low confidence — this extraction should be reviewed alongside the original source. Facts used in scoring: 52 ## Classification and evidence **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: Gold recoveries for Breccia Oxide reached up to 92.0% in column leach tests, which is exceptional for a heap leach operation. Evidence · text > positive gold recoveries of up to 92.0% **Pilot Scale Complete** Polarity: positive Definition: Pilot or demonstration plant testing completed under continuous operation. Why it applies: The metallurgical test program included 24 master-composite column tests, which are considered pilot-scale testwork for PFS-level studies. Evidence · text > 24 master-composite column tests **Free Milling** Polarity: positive Definition: Simple, clean ore amenable to standard processing without oxidation. Why it applies: Testing has shown no discernible issues with compact permeability, clay material, or preg-robbing concerns, indicating free-milling characteristics. Evidence · text > Testing to date has shown no discernible issues with compact permeability, clay material, preg-robbing concerns **Multi-Domain Tested** Polarity: positive Definition: Variability across ore domains \(oxide, transition, fresh\) has been addressed. Why it applies: The test program covered 24 to 28 potential geometallurgical domains, ensuring variability across principal lithologic, grade, and oxidation domains. Evidence · text > 24 to 28 potential geometallurgical domains **QP/CP Signed** Polarity: positive Story-specific tag Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: Barry Carlson, SME Registered Member, Principal Engineer - SLR International Corporation, is the Company's designated qualified person and has reviewed and approved the information. Evidence · text > Barry Carlson, SME Registered Member, Principal Engineer - SLR International Corporation, is the Company's designated qualified person **QA/QC Disclosed** Polarity: positive Story-specific tag Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: The release includes a detailed section on Metallurgical Test Work and Quality Assurance/Quality Control, mentioning industry best practices, sample tracking, chain of custody, and use of standards, blanks, and duplicates. Evidence · text > Sample custody, preparation, analytical procedures, quality assurance/quality control \(QA/QC\), and data validation were conducted in accordance with established industry best practices. **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: The project is explicitly described as the 'Richmond Hill Oxide Heap Leach Gold Project' and the testwork focuses on column leaching. Evidence · text > Richmond Hill Oxide Heap Leach Gold Project **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: Silver recoveries are generally low, with some column leach tests yielding as little as 4.6% for Tertiary Intrusives LG Oxide. Evidence · table > 4.6 Context: Tertiary Intrusives LG Oxide **Bench Scale Only** Polarity: negative Definition: Only preliminary bench tests completed — no locked-cycle or pilot work. Why it applies: Bottle roll tests, while providing initial screening, are considered bench-scale and do not fully represent commercial performance. Evidence · text > Bottle-roll and column-leach testing **Byproduct Commodity** Polarity: neutral Definition: The tested commodity is a byproduct rather than the primary economic driver. Why it applies: Silver is described as a 'co-product credit under evaluation' and its recoveries are generally lower and more variable than gold. Evidence · text > Silver remains a co-product credit under evaluation. **Mill Route** Polarity: neutral Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\). Why it applies: the document describes a mill\_cil route \("CIL"\) ## Extracted facts Stored fact records: 52. Some facts used in scoring do not have a stored record. ## Metallurgical Results (52) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-0) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Breccia Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 1032 hours #### Recovery - Recovery: 92 % - Recovery Basis: actual\_test - Head Grade: 1.097 - Head Grade Unit: g/t - Tailings Grade: 0.089 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Exceptional gold recovery of 92.0% for Breccia Oxide at 0.5-inch crush size, which is very strong for a heap leach operation and validates the project's amenability. - Positive factor: High Recovery - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route Evidence · table > 92.0 Context: Breccia Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 92% is at or above the exceptional band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-1) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Breccia Oxide 1" - Grind P80: 25.4 µm - Leach Time: 1128 hours #### Recovery - Recovery: 90.7 % - Recovery Basis: actual\_test - Head Grade: 1.097 - Head Grade Unit: g/t - Tailings Grade: 0.127 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Strong gold recovery of 90.7% for Breccia Oxide at 1-inch crush size, indicating good amenability to heap leaching even at coarser grind. - Positive factor: High Recovery - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route Evidence · table > 90.7 Context: Breccia Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 90.7% is at or above the exceptional band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-2) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Tertiary Intrusives HG Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 960 hours #### Recovery - Recovery: 80.9 % - Recovery Basis: actual\_test - Head Grade: 1.586 - Head Grade Unit: g/t - Tailings Grade: 0.304 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Good gold recovery of 80.9% for high-grade Tertiary Intrusives Oxide at 0.5-inch crush size, which is strong for a heap leach operation. - Positive factor: High Recovery - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route Evidence · table > 80.9 Context: Tertiary Intrusives HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 80.9% is at or above the exceptional band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-3) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Tertiary Intrusives LG Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 720 hours #### Recovery - Recovery: 79.2 % - Recovery Basis: actual\_test - Head Grade: 0.396 - Head Grade Unit: g/t - Tailings Grade: 0.064 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Good gold recovery of 79.2% for low-grade Tertiary Intrusives Oxide at 0.5-inch crush size, which is strong for a heap leach operation. - Positive factor: High Recovery - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route Evidence · table > 79.2 Context: Tertiary Intrusives LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 79.2% is at or above the exceptional band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-4) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Tertiary Intrusives HG Oxide 1" - Grind P80: 25.4 µm - Leach Time: 960 hours #### Recovery - Recovery: 71.8 % - Recovery Basis: actual\_test - Head Grade: 1.586 - Head Grade Unit: g/t - Tailings Grade: 0.528 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Moderate gold recovery of 71.8% for high-grade Tertiary Intrusives Oxide at 1-inch crush size, which is within the expected range for heap leaching. - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route Evidence · table > 71.8 Context: Tertiary Intrusives HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-5) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Tertiary Intrusives LG Oxide 1" - Grind P80: 25.4 µm - Leach Time: 720 hours #### Recovery - Recovery: 66.4 % - Recovery Basis: actual\_test - Head Grade: 0.396 - Head Grade Unit: g/t - Tailings Grade: 0.112 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Moderate gold recovery of 66.4% for low-grade Tertiary Intrusives Oxide at 1-inch crush size, which is within the expected range for heap leaching. - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route Evidence · table > 66.4 Context: Tertiary Intrusives LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-6) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Precambrian Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 864 hours #### Recovery - Recovery: 80.6 % - Recovery Basis: actual\_test - Head Grade: 0.575 - Head Grade Unit: g/t - Tailings Grade: 0.105 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Good gold recovery of 80.6% for Precambrian Oxide at 0.5-inch crush size, which is strong for a heap leach operation. - Positive factor: High Recovery - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route Evidence · table > 80.6 Context: Precambrian Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 80.6% is at or above the exceptional band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-7) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Precambrian Oxide 1" - Grind P80: 25.4 µm - Leach Time: 936 hours #### Recovery - Recovery: 74.4 % - Recovery Basis: actual\_test - Head Grade: 0.575 - Head Grade Unit: g/t - Tailings Grade: 0.146 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Moderate gold recovery of 74.4% for Precambrian Oxide at 1-inch crush size, which is within the expected range for heap leaching. - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route Evidence · table > 74.4 Context: Precambrian Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-8) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Deadwood LG Oxide 1" - Grind P80: 25.4 µm - Leach Time: 504 hours #### Recovery - Recovery: 73.4 % - Recovery Basis: actual\_test - Head Grade: 0.263 - Head Grade Unit: g/t - Tailings Grade: 0.082 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Moderate gold recovery of 73.4% for low-grade Deadwood Oxide at 1-inch crush size, which is within the expected range for heap leaching. - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route Evidence · table > 73.4 Context: Deadwood LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-9) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Deadwood HG Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 504 hours #### Recovery - Recovery: 65 % - Recovery Basis: actual\_test - Head Grade: 1.272 - Head Grade Unit: g/t - Tailings Grade: 0.454 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Moderate gold recovery of 65.0% for high-grade Deadwood Oxide at 0.5-inch crush size, which is within the expected range for heap leaching, though on the lower end for oxide material. - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route Evidence · table > 65.0 Context: Deadwood HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-10) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Deadwood HG Oxide 1" - Grind P80: 25.4 µm - Leach Time: 648 hours #### Recovery - Recovery: 59.2 % - Recovery Basis: actual\_test - Head Grade: 1.272 - Head Grade Unit: g/t - Tailings Grade: 0.619 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Lower gold recovery of 59.2% for high-grade Deadwood Oxide at 1-inch crush size, which is at the lower end of expected heap leach performance for oxide material. - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Lower Recovery Evidence · table > 59.2 Context: Deadwood HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-11) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Deadwood LG Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 504 hours #### Recovery - Recovery: 57.3 % - Recovery Basis: actual\_test - Head Grade: 0.263 - Head Grade Unit: g/t - Tailings Grade: 0.196 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Lower gold recovery of 57.3% for low-grade Deadwood Oxide at 0.5-inch crush size, which is at the lower end of expected heap leach performance for oxide material. - Positive factor: Pilot Scale Complete - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Lower Recovery Evidence · table > 57.3 Context: Deadwood LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-12) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Breccia Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 1032 hours #### Recovery - Recovery: 61.1 % - Recovery Basis: actual\_test - Head Grade: 12.8 - Head Grade Unit: g/t - Tailings Grade: 6.8 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Moderate silver recovery of 61.1% for Breccia Oxide at 0.5-inch crush size, which is reasonable for a co-product in a heap leach operation. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Byproduct Commodity Evidence · table > 61.1 Context: Breccia Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 61.1% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-13) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Breccia Oxide 1" - Grind P80: 25.4 µm - Leach Time: 1128 hours #### Recovery - Recovery: 46.8 % - Recovery Basis: actual\_test - Head Grade: 12.8 - Head Grade Unit: g/t - Tailings Grade: 7.9 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Lower silver recovery of 46.8% for Breccia Oxide at 1-inch crush size, indicating reduced extraction at coarser grind for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Lower Recovery - Negative factor: Byproduct Commodity Evidence · table > 46.8 Context: Breccia Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 46.8% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-14) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Tertiary Intrusives HG Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 960 hours #### Recovery - Recovery: 8.2 % - Recovery Basis: actual\_test - Head Grade: 14.3 - Head Grade Unit: g/t - Tailings Grade: 17.9 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Very low silver recovery of 8.2% for high-grade Tertiary Intrusives Oxide, indicating poor extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Very Low Recovery - Negative factor: Byproduct Commodity Evidence · table > 8.2 Context: Tertiary Intrusives HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 8.2% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-15) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Tertiary Intrusives LG Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 720 hours #### Recovery - Recovery: 9.1 % - Recovery Basis: actual\_test - Head Grade: 5.3 - Head Grade Unit: g/t - Tailings Grade: 5.4 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Very low silver recovery of 9.1% for low-grade Tertiary Intrusives Oxide, indicating poor extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Very Low Recovery - Negative factor: Byproduct Commodity Evidence · table > 9.1 Context: Tertiary Intrusives LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 9.1% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-16) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Tertiary Intrusives HG Oxide 1" - Grind P80: 25.4 µm - Leach Time: 960 hours #### Recovery - Recovery: 7 % - Recovery Basis: actual\_test - Head Grade: 14.3 - Head Grade Unit: g/t - Tailings Grade: 15.2 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Very low silver recovery of 7.0% for high-grade Tertiary Intrusives Oxide at 1-inch crush size, indicating poor extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Very Low Recovery - Negative factor: Byproduct Commodity Evidence · table > 7.0 Context: Tertiary Intrusives HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 7% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-17) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Tertiary Intrusives LG Oxide 1" - Grind P80: 25.4 µm - Leach Time: 720 hours #### Recovery - Recovery: 4.6 % - Recovery Basis: actual\_test - Head Grade: 5.3 - Head Grade Unit: g/t - Tailings Grade: 6 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Extremely low silver recovery of 4.6% for low-grade Tertiary Intrusives Oxide at 1-inch crush size, indicating very poor extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Very Low Recovery - Negative factor: Byproduct Commodity Evidence · table > 4.6 Context: Tertiary Intrusives LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 4.6% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-18) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Precambrian Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 864 hours #### Recovery - Recovery: 12 % - Recovery Basis: actual\_test - Head Grade: 6 - Head Grade Unit: g/t - Tailings Grade: 6.6 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Very low silver recovery of 12.0% for Precambrian Oxide, indicating poor extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Very Low Recovery - Negative factor: Byproduct Commodity Evidence · table > 12.0 Context: Precambrian Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 12% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-19) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Precambrian Oxide 1" - Grind P80: 25.4 µm - Leach Time: 936 hours #### Recovery - Recovery: 8.2 % - Recovery Basis: actual\_test - Head Grade: 6 - Head Grade Unit: g/t - Tailings Grade: 8 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Very low silver recovery of 8.2% for Precambrian Oxide at 1-inch crush size, indicating poor extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Very Low Recovery - Negative factor: Byproduct Commodity Evidence · table > 8.2 Context: Precambrian Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 8.2% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-20) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Deadwood LG Oxide 1" - Grind P80: 25.4 µm - Leach Time: 504 hours #### Recovery - Recovery: 8.3 % - Recovery Basis: actual\_test - Head Grade: 7.1 - Head Grade Unit: g/t - Tailings Grade: 8.1 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Very low silver recovery of 8.3% for low-grade Deadwood Oxide at 1-inch crush size, indicating poor extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Very Low Recovery - Negative factor: Byproduct Commodity Evidence · table > 8.3 Context: Deadwood LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 8.3% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-21) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Deadwood HG Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 504 hours #### Recovery - Recovery: 16.7 % - Recovery Basis: actual\_test - Head Grade: 29.7 - Head Grade Unit: g/t - Tailings Grade: 18.7 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Low silver recovery of 16.7% for high-grade Deadwood Oxide, indicating poor extraction for this co-product despite higher head grade. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Low Recovery - Negative factor: Byproduct Commodity Evidence · table > 16.7 Context: Deadwood HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 16.7% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-22) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Deadwood HG Oxide 1" - Grind P80: 25.4 µm - Leach Time: 648 hours #### Recovery - Recovery: 13.5 % - Recovery Basis: actual\_test - Head Grade: 29.7 - Head Grade Unit: g/t - Tailings Grade: 21.7 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Low silver recovery of 13.5% for high-grade Deadwood Oxide at 1-inch crush size, indicating poor extraction for this co-product despite higher head grade. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Low Recovery - Negative factor: Byproduct Commodity Evidence · table > 13.5 Context: Deadwood HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 13.5% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-23) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Deadwood LG Oxide 0.5" - Grind P80: 12.7 µm - Leach Time: 504 hours #### Recovery - Recovery: 8.9 % - Recovery Basis: actual\_test - Head Grade: 7.1 - Head Grade Unit: g/t - Tailings Grade: 9.4 - Tailings Grade Unit: g/t #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Very low silver recovery of 8.9% for low-grade Deadwood Oxide, indicating poor extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Very Low Recovery - Negative factor: Byproduct Commodity Evidence · table > 8.9 Context: Deadwood LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 8.9% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-24) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Breccia Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 94.6 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: High gold recovery of 94.6% in bottle roll tests for Breccia Oxide at 0.5-inch crush size, indicating strong amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 94.6 Context: Breccia Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 94.6% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-25) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Breccia Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 94.6 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: High gold recovery of 94.6% in bottle roll tests for Breccia Oxide at 1-inch crush size, indicating strong amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 94.6 Context: Breccia Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 94.6% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-26) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Tertiary Intrusives HG Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 91.2 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Strong gold recovery of 91.2% in bottle roll tests for high-grade Tertiary Intrusives Oxide, indicating good amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 91.2 Context: Tertiary Intrusives HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 91.2% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-27) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Tertiary Intrusives LG Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 86.9 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Strong gold recovery of 86.9% in bottle roll tests for low-grade Tertiary Intrusives Oxide, indicating good amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 86.9 Context: Tertiary Intrusives LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 86.9% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-28) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Tertiary Intrusives HG Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 91.2 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Strong gold recovery of 91.2% in bottle roll tests for high-grade Tertiary Intrusives Oxide, indicating good amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 91.2 Context: Tertiary Intrusives HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 91.2% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-29) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Tertiary Intrusives LG Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 86.9 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Strong gold recovery of 86.9% in bottle roll tests for low-grade Tertiary Intrusives Oxide, indicating good amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 86.9 Context: Tertiary Intrusives LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 86.9% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-30) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Precambrian Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 82.5 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Strong gold recovery of 82.5% in bottle roll tests for Precambrian Oxide, indicating good amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 82.5 Context: Precambrian Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 82.5% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-31) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Precambrian Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 82.5 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Strong gold recovery of 82.5% in bottle roll tests for Precambrian Oxide, indicating good amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 82.5 Context: Precambrian Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 82.5% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-32) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Deadwood LG Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 88 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Strong gold recovery of 88.0% in bottle roll tests for low-grade Deadwood Oxide, indicating good amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 88.0 Context: Deadwood LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 88% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-33) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Deadwood HG Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 88.5 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Strong gold recovery of 88.5% in bottle roll tests for high-grade Deadwood Oxide, indicating good amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 88.5 Context: Deadwood HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 88.5% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-34) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Deadwood HG Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 88.5 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Strong gold recovery of 88.5% in bottle roll tests for high-grade Deadwood Oxide, indicating good amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 88.5 Context: Deadwood HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 88.5% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-35) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Deadwood LG Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 88 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Strong gold recovery of 88.0% in bottle roll tests for low-grade Deadwood Oxide, indicating good amenability at a screening level. - Positive factor: High Recovery - Positive factor: Free Milling - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Bench Scale Only Evidence · table > 88.0 Context: Deadwood LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: 88% is at or above the exceptional band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-36) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Breccia Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 69.3 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Moderate silver recovery of 69.3% in bottle roll tests for Breccia Oxide, which is reasonable for a co-product at a screening level. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 69.3 Context: Breccia Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 69.3% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-37) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Breccia Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 69.3 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Moderate silver recovery of 69.3% in bottle roll tests for Breccia Oxide, which is reasonable for a co-product at a screening level. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 69.3 Context: Breccia Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 69.3% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-38) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Tertiary Intrusives HG Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 35.4 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Low silver recovery of 35.4% in bottle roll tests for high-grade Tertiary Intrusives Oxide, indicating limited extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Low Recovery - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 35.4 Context: Tertiary Intrusives HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 35.4% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-39) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Tertiary Intrusives LG Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 38.8 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Low silver recovery of 38.8% in bottle roll tests for low-grade Tertiary Intrusives Oxide, indicating limited extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Low Recovery - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 38.8 Context: Tertiary Intrusives LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 38.8% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-40) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Tertiary Intrusives HG Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 35.4 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Low silver recovery of 35.4% in bottle roll tests for high-grade Tertiary Intrusives Oxide, indicating limited extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Low Recovery - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 35.4 Context: Tertiary Intrusives HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 35.4% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-41) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Tertiary Intrusives LG Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 38.8 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Low silver recovery of 38.8% in bottle roll tests for low-grade Tertiary Intrusives Oxide, indicating limited extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Low Recovery - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 38.8 Context: Tertiary Intrusives LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 38.8% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-42) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Precambrian Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 39.3 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Low silver recovery of 39.3% in bottle roll tests for Precambrian Oxide, indicating limited extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Low Recovery - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 39.3 Context: Precambrian Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 39.3% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-43) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Precambrian Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 39.3 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Low silver recovery of 39.3% in bottle roll tests for Precambrian Oxide, indicating limited extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Low Recovery - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 39.3 Context: Precambrian Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 39.3% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-44) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Deadwood LG Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 37.8 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Low silver recovery of 37.8% in bottle roll tests for low-grade Deadwood Oxide, indicating limited extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Low Recovery - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 37.8 Context: Deadwood LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 37.8% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-45) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Deadwood HG Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 62.3 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Moderate silver recovery of 62.3% in bottle roll tests for high-grade Deadwood Oxide, which is reasonable for a co-product at a screening level. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 62.3 Context: Deadwood HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 62.3% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-46) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Deadwood HG Oxide 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 62.3 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Moderate silver recovery of 62.3% in bottle roll tests for high-grade Deadwood Oxide, which is reasonable for a co-product at a screening level. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 62.3 Context: Deadwood HG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 62.3% is below the weak band \(75%\) ### bottle roll [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-47) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: bottle roll - Processing Route: heap leach - Sample: Deadwood LG Oxide 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 37.8 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Low silver recovery of 37.8% in bottle roll tests for low-grade Deadwood Oxide, indicating limited extraction for this co-product. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Low Recovery - Negative factor: Byproduct Commodity - Negative factor: Bench Scale Only Evidence · table > 37.8 Context: Deadwood LG Oxide #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 37.8% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-48) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Transition material 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 74.4 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Mean gold recovery of 74.4% for transition material at 0.5-inch crush size, which is lower than oxide but still being evaluated for potential inclusion in the mine plan. - Positive factor: Pilot Scale Complete - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Lower Recovery - Negative factor: Less Material Expected Evidence · table > 74.4% Context: Transition / 0.5" #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-49) Richmond Hill · gold #### Identity - Project: Richmond Hill - Commodity: gold - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Transition material 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 70.3 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Mean gold recovery of 70.3% for transition material at 1-inch crush size, which is lower than oxide and indicates reduced extraction at coarser grind for this less material. - Positive factor: Pilot Scale Complete - Positive factor: Multi-Domain Tested - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Lower Recovery - Negative factor: Less Material Expected Evidence · table > 70.3% Context: Transition / 1" #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-50) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Transition material 0.5" - Grind P80: 12.7 µm #### Recovery - Recovery: 15.8 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Very low mean silver recovery of 15.8% for transition material at 0.5-inch crush size, indicating limited economic contribution from silver in this material. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Very Low Recovery - Negative factor: Byproduct Commodity - Negative factor: Less Material Expected Evidence · table > 23.2-8.4% Context: Transition / 0.5" #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 15.8% is below the weak band \(75%\) ### column leach [Link to this fact](https://atlas-staging.minestarters.com/news/dakota-gold-reports-positive-metallurgical-test-program-results-informing-the-ri--3a9a10b6-cc92-4d4a-8bd3-a232675bf130#fact-metallurgical-facts-51) Richmond Hill · silver #### Identity - Project: Richmond Hill - Commodity: silver - Region: south dakota - Reported Region: South Dakota - Ticker: DC #### Test Work - Program Status: detailed - Test Type: column leach - Processing Route: heap leach - Sample: Transition material 1" - Grind P80: 25.4 µm #### Recovery - Recovery: 12.9 % - Recovery Basis: actual\_test #### Lab - Laboratory: Forte Dynamics, Inc. - Consultant: SLR International Corporation #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: Very low mean silver recovery of 12.9% for transition material at 1-inch crush size, indicating very limited economic contribution from silver in this material. - Positive factor: QP/CP Signed - Positive factor: QA/QC Disclosed - Positive factor: Heap Leach Route - Negative factor: Very Low Recovery - Negative factor: Byproduct Commodity - Negative factor: Less Material Expected Evidence · table > 18.9-6.9% Context: Transition / 1" #### Tags used in scoring **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: processing\_route matches the heap\_leach signal **Low Recovery** Polarity: negative Definition: Recovery below the weak band for the commodity and processing route. Why it applies: 12.9% is below the weak band \(75%\) ## How Atlas produces this analysis Minestarters Atlas uses automated extraction to summarize mining announcements, identify reported measurements, and classify supporting evidence. Sentiment reflects the extracted narrative and classification rules; it is an interpretation, not a reported measurement. Evidence quotes and context are provided where available. Missing data, low-confidence results, and review flags indicate limitations. Check the original publisher announcement before relying on an interpretation.