Dakota Gold Reports Positive Metallurgical Test Program Results Informing the Richmond Hill Pre-Feasibility Study
Original announcement by newsfile on
- 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
Analysis by Minestarters Atlas
Minestarters Atlas analysis
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 factors
- High Gold Recovery
- Pilot Scale Testwork
- Free Milling Characteristics
- Multi-Domain Testing
- QP/CP Signed Report
- Comprehensive QA/QC
Negative factors
- Variable Silver Recovery
- 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 Recoverypositive
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 Completepositive
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 Millingpositive
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 Testedpositive
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 Signedpositive · Story-specific tag
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 Disclosedpositive · Story-specific tag
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 Routeneutral
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 Recoverynegative
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 Onlynegative
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 Commodityneutral
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 Routeneutral
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 leachRichmond Hill · goldRecovery: 92 %Head Grade: 1.097Head Grade Unit: g/tView all detailsHide details
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 factors
- High Recovery
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Evidence · table
“92.0”
Context: Breccia Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 leachRichmond Hill · goldRecovery: 90.7 %Head Grade: 1.097Head Grade Unit: g/tView all detailsHide details
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 factors
- High Recovery
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Evidence · table
“90.7”
Context: Breccia Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 leachRichmond Hill · goldRecovery: 80.9 %Head Grade: 1.586Head Grade Unit: g/tView all detailsHide details
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 factors
- High Recovery
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Evidence · table
“80.9”
Context: Tertiary Intrusives HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 leachRichmond Hill · goldRecovery: 79.2 %Head Grade: 0.396Head Grade Unit: g/tView all detailsHide details
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 factors
- High Recovery
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Evidence · table
“79.2”
Context: Tertiary Intrusives LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 leachRichmond Hill · goldRecovery: 71.8 %Head Grade: 1.586Head Grade Unit: g/tView all detailsHide details
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 factors
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Evidence · table
“71.8”
Context: Tertiary Intrusives HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachRichmond Hill · goldRecovery: 66.4 %Head Grade: 0.396Head Grade Unit: g/tView all detailsHide details
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 factors
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Evidence · table
“66.4”
Context: Tertiary Intrusives LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachRichmond Hill · goldRecovery: 80.6 %Head Grade: 0.575Head Grade Unit: g/tView all detailsHide details
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 factors
- High Recovery
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Evidence · table
“80.6”
Context: Precambrian Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 leachRichmond Hill · goldRecovery: 74.4 %Head Grade: 0.575Head Grade Unit: g/tView all detailsHide details
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 factors
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Evidence · table
“74.4”
Context: Precambrian Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachRichmond Hill · goldRecovery: 73.4 %Head Grade: 0.263Head Grade Unit: g/tView all detailsHide details
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 factors
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Evidence · table
“73.4”
Context: Deadwood LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachRichmond Hill · goldRecovery: 65 %Head Grade: 1.272Head Grade Unit: g/tView all detailsHide details
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 factors
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Evidence · table
“65.0”
Context: Deadwood HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachRichmond Hill · goldRecovery: 59.2 %Head Grade: 1.272Head Grade Unit: g/tView all detailsHide details
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 factors
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Lower Recovery
Evidence · table
“59.2”
Context: Deadwood HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachRichmond Hill · goldRecovery: 57.3 %Head Grade: 0.263Head Grade Unit: g/tView all detailsHide details
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 factors
- Pilot Scale Complete
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Lower Recovery
Evidence · table
“57.3”
Context: Deadwood LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachRichmond Hill · silverRecovery: 61.1 %Head Grade: 12.8Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Byproduct Commodity
Evidence · table
“61.1”
Context: Breccia Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 61.1% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 46.8 %Head Grade: 12.8Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Lower Recovery
- Byproduct Commodity
Evidence · table
“46.8”
Context: Breccia Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 46.8% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 8.2 %Head Grade: 14.3Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Very Low Recovery
- Byproduct Commodity
Evidence · table
“8.2”
Context: Tertiary Intrusives HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 8.2% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 9.1 %Head Grade: 5.3Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Very Low Recovery
- Byproduct Commodity
Evidence · table
“9.1”
Context: Tertiary Intrusives LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 9.1% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 7 %Head Grade: 14.3Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Very Low Recovery
- Byproduct Commodity
Evidence · table
“7.0”
Context: Tertiary Intrusives HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 7% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 4.6 %Head Grade: 5.3Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Very Low Recovery
- Byproduct Commodity
Evidence · table
“4.6”
Context: Tertiary Intrusives LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 4.6% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 12 %Head Grade: 6Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Very Low Recovery
- Byproduct Commodity
Evidence · table
“12.0”
Context: Precambrian Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 12% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 8.2 %Head Grade: 6Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Very Low Recovery
- Byproduct Commodity
Evidence · table
“8.2”
Context: Precambrian Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 8.2% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 8.3 %Head Grade: 7.1Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Very Low Recovery
- Byproduct Commodity
Evidence · table
“8.3”
Context: Deadwood LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 8.3% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 16.7 %Head Grade: 29.7Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Low Recovery
- Byproduct Commodity
Evidence · table
“16.7”
Context: Deadwood HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 16.7% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 13.5 %Head Grade: 29.7Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Low Recovery
- Byproduct Commodity
Evidence · table
“13.5”
Context: Deadwood HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 13.5% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 8.9 %Head Grade: 7.1Head Grade Unit: g/tView all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Very Low Recovery
- Byproduct Commodity
Evidence · table
“8.9”
Context: Deadwood LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 8.9% is below the weak band (75%)
bottle rollRichmond Hill · goldRecovery: 94.6 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“94.6”
Context: Breccia Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · goldRecovery: 94.6 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“94.6”
Context: Breccia Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · goldRecovery: 91.2 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“91.2”
Context: Tertiary Intrusives HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · goldRecovery: 86.9 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“86.9”
Context: Tertiary Intrusives LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · goldRecovery: 91.2 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“91.2”
Context: Tertiary Intrusives HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · goldRecovery: 86.9 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“86.9”
Context: Tertiary Intrusives LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · goldRecovery: 82.5 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“82.5”
Context: Precambrian Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · goldRecovery: 82.5 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“82.5”
Context: Precambrian Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · goldRecovery: 88 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“88.0”
Context: Deadwood LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · goldRecovery: 88.5 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“88.5”
Context: Deadwood HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · goldRecovery: 88.5 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“88.5”
Context: Deadwood HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · goldRecovery: 88 %View all detailsHide details
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 factors
- High Recovery
- Free Milling
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Bench Scale Only
Evidence · table
“88.0”
Context: Deadwood LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
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 rollRichmond Hill · silverRecovery: 69.3 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“69.3”
Context: Breccia Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 69.3% is below the weak band (75%)
bottle rollRichmond Hill · silverRecovery: 69.3 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“69.3”
Context: Breccia Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 69.3% is below the weak band (75%)
bottle rollRichmond Hill · silverRecovery: 35.4 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Low Recovery
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“35.4”
Context: Tertiary Intrusives HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 35.4% is below the weak band (75%)
bottle rollRichmond Hill · silverRecovery: 38.8 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Low Recovery
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“38.8”
Context: Tertiary Intrusives LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 38.8% is below the weak band (75%)
bottle rollRichmond Hill · silverRecovery: 35.4 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Low Recovery
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“35.4”
Context: Tertiary Intrusives HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 35.4% is below the weak band (75%)
bottle rollRichmond Hill · silverRecovery: 38.8 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Low Recovery
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“38.8”
Context: Tertiary Intrusives LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 38.8% is below the weak band (75%)
bottle rollRichmond Hill · silverRecovery: 39.3 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Low Recovery
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“39.3”
Context: Precambrian Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 39.3% is below the weak band (75%)
bottle rollRichmond Hill · silverRecovery: 39.3 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Low Recovery
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“39.3”
Context: Precambrian Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 39.3% is below the weak band (75%)
bottle rollRichmond Hill · silverRecovery: 37.8 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Low Recovery
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“37.8”
Context: Deadwood LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 37.8% is below the weak band (75%)
bottle rollRichmond Hill · silverRecovery: 62.3 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“62.3”
Context: Deadwood HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 62.3% is below the weak band (75%)
bottle rollRichmond Hill · silverRecovery: 62.3 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“62.3”
Context: Deadwood HG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 62.3% is below the weak band (75%)
bottle rollRichmond Hill · silverRecovery: 37.8 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Low Recovery
- Byproduct Commodity
- Bench Scale Only
Evidence · table
“37.8”
Context: Deadwood LG Oxide
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 37.8% is below the weak band (75%)
column leachRichmond Hill · goldRecovery: 74.4 %View all detailsHide details
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 factors
- Pilot Scale Complete
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Lower Recovery
- Less Material Expected
Evidence · table
“74.4%”
Context: Transition / 0.5"
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachRichmond Hill · goldRecovery: 70.3 %View all detailsHide details
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 factors
- Pilot Scale Complete
- Multi-Domain Tested
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Lower Recovery
- Less Material Expected
Evidence · table
“70.3%”
Context: Transition / 1"
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
column leachRichmond Hill · silverRecovery: 15.8 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Very Low Recovery
- Byproduct Commodity
- Less Material Expected
Evidence · table
“23.2-8.4%”
Context: Transition / 0.5"
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 15.8% is below the weak band (75%)
column leachRichmond Hill · silverRecovery: 12.9 %View all detailsHide details
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 factors
- QP/CP Signed
- QA/QC Disclosed
- Heap Leach Route
Negative factors
- Very Low Recovery
- Byproduct Commodity
- Less Material Expected
Evidence · table
“18.9-6.9%”
Context: Transition / 1"
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
Low Recoverynegative
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.