Blossom Gold Reports Initial Metallurgical Results and Engagement of Metallurgical Advisor for the Rosebud Open-Pit, Heap-Leach Project
Original announcement by globenewswire on
- Company
- Blossom Gold Inc.
- Ticker
- BGAU
- Exchange
- Unavailable
- Region
- Nevada
- Primary commodity
- Gold
- Secondary commodities
- Silver
- Document categories
- Metallurgy
- Extracted
- 2026-08-27 10:34:12 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Blossom Gold Inc. announced initial bottle roll metallurgical test results for its Rosebud Open-Pit, Heap-Leach Project in Nevada. Oxide material showed gold recoveries in the low 70s, meeting expectations, while silver recoveries were better than anticipated. However, fresh rock material exhibited poor gold recoveries, particularly in samples with higher sulfide content, indicating a need for further test work to address leaching challenges.
Reasoning: Blossom Gold's initial bottle roll metallurgical test results for the Rosebud project show promising gold recoveries for oxide material and better-than-expected silver recoveries, with no preg-robbing or significant deleterious elements identified. However, fresh rock material exhibits poor gold recoveries, indicating a refractory component related to sulfides that requires further metallurgical investigation and optimization. The company is addressing this by engaging an experienced advisor and planning more detailed test work, including column leach tests.
Positive factors
- Initial results for oxide material are in line with expectations for heap leach
- Silver recoveries were better than expected across all samples
- Additional testing confirmed non-preg-robbing material and low levels of mercury and copper
- Engagement of an experienced metallurgical advisor (Jim Wickens) to guide further test work
- Planning for more advanced test work, including column leach tests and additional PQ core drilling
Negative factors
- Fresh rock material exhibited poor gold recoveries, particularly in samples with higher sulfide content
- Sulfides in some fresh rock material (BG26-008) are preventing or slowing precious metal leaching, requiring further investigation
- Current results are from preliminary bottle roll tests, which are bench-scale and not definitive for feasibility studies
- Variability in head grades near cutoff impacts recovery consistency
Facts used in scoring: 52
Classification and evidence
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: The document explicitly states the project is the 'Rosebud Open-Pit, Heap-Leach Project' and discusses 'bottle roll leach tests'.
Evidence · text
“Rosebud Open-Pit, Heap-Leach Project”
Bench Scale Onlynegative
Only preliminary bench tests completed — no locked-cycle or pilot work.
Why it applies: The reported results are from 'initial bottle roll test results', which are considered preliminary and bench-scale.
Evidence · text
“initial bottle roll test results”
Refractory Orenegative
Ore requires oxidation/pressure treatment before recovery — a processing and recovery risk.
Why it applies: The document notes that 'some characteristic of the sulfides in that material is slowing or preventing leaching of precious metals' and that 'Roasting the BG26-008 material resulted in over 100% estimated recovery', indicating refractory material.
Evidence · text
“some characteristic of the sulfides in that material is slowing or preventing leaching of precious metals, especially gold, and will require additional test work and analysis. Roasting the BG26-008 material resulted in over 100% estimated recovery”
Free Millingpositive
Simple, clean ore amenable to standard processing without oxidation.
Why it applies: Standard preg-robbing shake tests demonstrated non preg-robbing material in all samples, consistent with the lack of carbonate rocks and nil organic carbon.
Evidence · text
“Standard preg-robbing shake tests demonstrated non preg-robbing material in all samples, consistent with the lack of carbonate rocks in drill core and nil organic carbon in all samples.”
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: The scientific and technical information has been reviewed and approved by Dino Titaro, P.Geo., a Qualified Person.
Evidence · text
“The scientific and technical information contained in this news release has been reviewed and approved by Dino Titaro, P.Geo., a Director of Blossom who is a Qualified Person as defined in National Instrument 43-101”
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 Quality Assurance/Quality Control procedures for core logging, sampling, and analysis.
Evidence · text
“Quality Assurance/Quality Control (QA/QC) Core from the field is logged, photographed and cut with halved drill core samples bagged and sealed for pick-up by MSALABS in Elko, Nevada for preparation and analysis.”
Certified Labpositive · Story-specific tag
No canonical definition is currently available.
Why it applies: MSALABS, the laboratory conducting the analysis, is stated to be accredited to ISO 17025 standards.
Evidence · text
“MSALABS is accredited to ISO 17025 standards for gold and silver assays.”
Multi-Domain Testedpositive
Variability across ore domains (oxide, transition, fresh) has been addressed.
Why it applies: The test program includes 'multiple host rock types and alteration styles from both oxidized and fresh rock'.
Evidence · text
“multiple host rock types and alteration styles from both oxidized and fresh rock”
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: The average estimated recovery for fresh rock at a 25mm crush was 36% for gold, which is below the weak threshold for heap leach.
Evidence · text
“The average estimated recovery for fresh rock at a 25mm crush was 36% for gold”
Recovery Improvingpositive
Recovery improved versus a like-for-like prior test program on the same domain and route.
Why it applies: Roasting the BG26-008 material resulted in over 100% estimated recovery, indicating a significant improvement for this specific refractory material.
Evidence · text
“Roasting the BG26-008 material resulted in over 100% estimated recovery”
Extracted facts
Stored fact records: 52. Some facts used in scoring do not have a stored record.
Metallurgical Results (52)
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 48 %Head Grade: 1.743Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-002 dacite lapilli tuff 130' - 180' fresh
- Grind P80
- 50000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 48 %
- Recovery Basis
- actual_test
- Head Grade
- 1.743
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.06 kg/t
- Lime
- 1 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 48% from fresh rock is weak for a heap leach project, indicating potential processing challenges, especially with 1.81% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“48 %”
Context: 1.743
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 31 %Head Grade: 8.07Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-002 dacite lapilli tuff 130' - 180' fresh
- Grind P80
- 50000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 31 %
- Recovery Basis
- actual_test
- Head Grade
- 8.07
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.06 kg/t
- Lime
- 1 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 31% from fresh rock is very low for a heap leach project, indicating significant processing challenges, especially with 1.81% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“31 %”
Context: 8.07
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 58 %Head Grade: 0.764Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-002 dacite lapilli tuff 130' - 180' fresh
- Grind P80
- 25000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 58 %
- Recovery Basis
- actual_test
- Head Grade
- 0.764
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.12 kg/t
- Lime
- 1 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 58% from fresh rock is moderate for a heap leach project, but still indicates processing challenges due to 1.81% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Refractory Ore
- Bench Scale Only
Evidence · table
“58 %”
Context: 0.764
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 34 %Head Grade: 4.33Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-002 dacite lapilli tuff 130' - 180' fresh
- Grind P80
- 25000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 34 %
- Recovery Basis
- actual_test
- Head Grade
- 4.33
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.12 kg/t
- Lime
- 1 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 34% from fresh rock is very low for a heap leach project, indicating significant processing challenges, especially with 1.81% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“34 %”
Context: 4.33
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 39 %Head Grade: 1.665Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-002 dacite lapilli tuff 130' - 180' fresh
- Grind P80
- 9500 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 39 %
- Recovery Basis
- actual_test
- Head Grade
- 1.665
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.24 kg/t
- Lime
- 1 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 39% from fresh rock is below weak for a heap leach project, indicating significant processing challenges, especially with 1.81% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“39 %”
Context: 1.665
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 27 %Head Grade: 6.13Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-002 dacite lapilli tuff 130' - 180' fresh
- Grind P80
- 9500 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 27 %
- Recovery Basis
- actual_test
- Head Grade
- 6.13
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.24 kg/t
- Lime
- 1 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 27% from fresh rock is very low for a heap leach project, indicating significant processing challenges, especially with 1.81% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“27 %”
Context: 6.13
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 85 %Head Grade: 0.447Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-002 dacite lapilli tuff 130' - 180' fresh (pulverized)
- Leach Time
- 96 hours
Recovery
- Recovery
- 85 %
- Recovery Basis
- actual_test
- Head Grade
- 0.447
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.19 kg/t
- Lime
- 1.75 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 85% from pulverized fresh rock is exceptional for a heap leach project, suggesting that finer grinding could significantly improve recovery, despite the presence of 1.81% sulfide sulfur. This is a preliminary bottle roll test.
Positive factors
- High Recovery
Negative factors
- Refractory Ore
- Bench Scale Only
Evidence · table
“85 %”
Context: 0.447
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 53 %Head Grade: 3.85Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-002 dacite lapilli tuff 130' - 180' fresh (pulverized)
- Leach Time
- 96 hours
Recovery
- Recovery
- 53 %
- Recovery Basis
- actual_test
- Head Grade
- 3.85
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.19 kg/t
- Lime
- 1.75 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 53% from pulverized fresh rock is weak for a heap leach project, indicating processing challenges despite finer grinding and the presence of 1.81% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Refractory Ore
- Bench Scale Only
Evidence · table
“53 %”
Context: 3.85
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 29 %Head Grade: 1.039Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 95' - 145' oxide
- Grind P80
- 50000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 29 %
- Recovery Basis
- actual_test
- Head Grade
- 1.039
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.09 kg/t
- Lime
- 3.75 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 29% from oxide material is very low for a heap leach project, indicating significant processing challenges despite low sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Bench Scale Only
Evidence · table
“29 %”
Context: 1.039
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 71 %Head Grade: 4.55Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 95' - 145' oxide
- Grind P80
- 50000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 71 %
- Recovery Basis
- actual_test
- Head Grade
- 4.55
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.09 kg/t
- Lime
- 3.75 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 71% from oxide material is strong for a heap leach project, indicating good processing characteristics despite the presence of 0.11% organic carbon. This is a preliminary bottle roll test.
Negative factors
- Bench Scale Only
Evidence · table
“71 %”
Context: 4.55
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 81 %Head Grade: 0.301Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 95' - 145' oxide
- Grind P80
- 25000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 81 %
- Recovery Basis
- actual_test
- Head Grade
- 0.301
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.13 kg/t
- Lime
- 4 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 81% from oxide material is exceptional for a heap leach project, indicating very good processing characteristics despite the presence of 0.11% organic carbon. This is a preliminary bottle roll test.
Positive factors
- High Recovery
Negative factors
- Bench Scale Only
Evidence · table
“81 %”
Context: 0.301
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 65 %Head Grade: 2.62Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 95' - 145' oxide
- Grind P80
- 25000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 65 %
- Recovery Basis
- actual_test
- Head Grade
- 2.62
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.13 kg/t
- Lime
- 4 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 65% from oxide material is strong for a heap leach project, indicating good processing characteristics despite the presence of 0.11% organic carbon. This is a preliminary bottle roll test.
Positive factors
- High Recovery
Negative factors
- Bench Scale Only
Evidence · table
“65 %”
Context: 2.62
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 77 %Head Grade: 0.299Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 95' - 145' oxide
- Grind P80
- 9500 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 77 %
- Recovery Basis
- actual_test
- Head Grade
- 0.299
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.2 kg/t
- Lime
- 5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 77% from oxide material is exceptional for a heap leach project, indicating very good processing characteristics despite the presence of 0.11% organic carbon. This is a preliminary bottle roll test.
Positive factors
- High Recovery
Negative factors
- Bench Scale Only
Evidence · table
“77 %”
Context: 0.299
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 58 %Head Grade: 4.68Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 95' - 145' oxide
- Grind P80
- 9500 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 58 %
- Recovery Basis
- actual_test
- Head Grade
- 4.68
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.2 kg/t
- Lime
- 5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 58% from oxide material is moderate for a heap leach project, indicating acceptable processing characteristics despite the presence of 0.11% organic carbon. This is a preliminary bottle roll test.
Negative factors
- Bench Scale Only
Evidence · table
“58 %”
Context: 4.68
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 87 %Head Grade: 0.328Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 95' - 145' oxide (pulverized)
- Leach Time
- 96 hours
Recovery
- Recovery
- 87 %
- Recovery Basis
- actual_test
- Head Grade
- 0.328
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 1.72 kg/t
- Lime
- 4.75 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 87% from pulverized oxide material is exceptional for a heap leach project, indicating very good processing characteristics despite the presence of 0.11% organic carbon. This is a preliminary bottle roll test.
Positive factors
- High Recovery
Negative factors
- Bench Scale Only
Evidence · table
“87 %”
Context: 0.328
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 80 %Head Grade: 3.51Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 95' - 145' oxide (pulverized)
- Leach Time
- 96 hours
Recovery
- Recovery
- 80 %
- Recovery Basis
- actual_test
- Head Grade
- 3.51
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 1.72 kg/t
- Lime
- 4.75 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 80% from pulverized oxide material is exceptional for a heap leach project, indicating very good processing characteristics despite the presence of 0.11% organic carbon. This is a preliminary bottle roll test.
Positive factors
- High Recovery
Negative factors
- Bench Scale Only
Evidence · table
“80 %”
Context: 3.51
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 60 %Head Grade: 0.2Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 195' - 245' oxide
- Grind P80
- 50000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 60 %
- Recovery Basis
- actual_test
- Head Grade
- 0.2
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.07 kg/t
- Lime
- 4.5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 60% from oxide material is moderate for a heap leach project, indicating acceptable processing characteristics. This is a preliminary bottle roll test.
Negative factors
- Bench Scale Only
Evidence · table
“60 %”
Context: 0.200
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 49 %Head Grade: 3.69Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 195' - 245' oxide
- Grind P80
- 50000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 49 %
- Recovery Basis
- actual_test
- Head Grade
- 3.69
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.07 kg/t
- Lime
- 4.5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 49% from oxide material is weak for a heap leach project, indicating potential processing challenges. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Bench Scale Only
Evidence · table
“49 %”
Context: 3.69
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 65 %Head Grade: 0.211Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 195' - 245' oxide
- Grind P80
- 25000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 65 %
- Recovery Basis
- actual_test
- Head Grade
- 0.211
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.1 kg/t
- Lime
- 5.5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 65% from oxide material is strong for a heap leach project, indicating good processing characteristics. This is a preliminary bottle roll test.
Positive factors
- High Recovery
Negative factors
- Bench Scale Only
Evidence · table
“65 %”
Context: 0.211
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 61 %Head Grade: 4.88Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 195' - 245' oxide
- Grind P80
- 25000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 61 %
- Recovery Basis
- actual_test
- Head Grade
- 4.88
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.1 kg/t
- Lime
- 5.5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 61% from oxide material is moderate for a heap leach project, indicating acceptable processing characteristics. This is a preliminary bottle roll test.
Negative factors
- Bench Scale Only
Evidence · table
“61 %”
Context: 4.88
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 76 %Head Grade: 0.181Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 195' - 245' oxide
- Grind P80
- 9500 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 76 %
- Recovery Basis
- actual_test
- Head Grade
- 0.181
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.17 kg/t
- Lime
- 6.5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 76% from oxide material is exceptional for a heap leach project, indicating very good processing characteristics. This is a preliminary bottle roll test.
Positive factors
- High Recovery
Negative factors
- Bench Scale Only
Evidence · table
“76 %”
Context: 0.181
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 72 %Head Grade: 7.54Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 195' - 245' oxide
- Grind P80
- 9500 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 72 %
- Recovery Basis
- actual_test
- Head Grade
- 7.54
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.17 kg/t
- Lime
- 6.5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 72% from oxide material is strong for a heap leach project, indicating good processing characteristics. This is a preliminary bottle roll test.
Negative factors
- Bench Scale Only
Evidence · table
“72 %”
Context: 7.54
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 83 %Head Grade: 0.135Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 195' - 245' oxide (pulverized)
- Leach Time
- 96 hours
Recovery
- Recovery
- 83 %
- Recovery Basis
- actual_test
- Head Grade
- 0.135
- Head Grade Unit
- g/t
Reagents
- Lime
- 7 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 83% from pulverized oxide material is exceptional for a heap leach project, indicating very good processing characteristics. This is a preliminary bottle roll test.
Positive factors
- High Recovery
Negative factors
- Bench Scale Only
Evidence · table
“83 %”
Context: 0.135
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 86 %Head Grade: 5.3Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 195' - 245' oxide (pulverized)
- Leach Time
- 96 hours
Recovery
- Recovery
- 86 %
- Recovery Basis
- actual_test
- Head Grade
- 5.3
- Head Grade Unit
- g/t
Reagents
- Lime
- 7 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 86% from pulverized oxide material is exceptional for a heap leach project, indicating very good processing characteristics. This is a preliminary bottle roll test.
Positive factors
- High Recovery
Negative factors
- Bench Scale Only
Evidence · table
“86 %”
Context: 5.30
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 40 %Head Grade: 0.152Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 295' - 345' fresh
- Grind P80
- 50000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 40 %
- Recovery Basis
- actual_test
- Head Grade
- 0.152
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.12 kg/t
- Lime
- 3.75 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 40% from fresh rock is below weak for a heap leach project, indicating significant processing challenges, especially with 1.62% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“40 %”
Context: 0.152
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 41 %Head Grade: 2.48Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 295' - 345' fresh
- Grind P80
- 50000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 41 %
- Recovery Basis
- actual_test
- Head Grade
- 2.48
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.12 kg/t
- Lime
- 3.75 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 41% from fresh rock is weak for a heap leach project, indicating potential processing challenges, especially with 1.62% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“41 %”
Context: 2.48
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 29 %Head Grade: 0.125Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 295' - 345' fresh
- Grind P80
- 25000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 29 %
- Recovery Basis
- actual_test
- Head Grade
- 0.125
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.35 kg/t
- Lime
- 4 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 29% from fresh rock is very low for a heap leach project, indicating significant processing challenges, especially with 1.62% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“29 %”
Context: 0.125
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 45 %Head Grade: 3.07Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 295' - 345' fresh
- Grind P80
- 25000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 45 %
- Recovery Basis
- actual_test
- Head Grade
- 3.07
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.35 kg/t
- Lime
- 4 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 45% from fresh rock is weak for a heap leach project, indicating potential processing challenges, especially with 1.62% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“45 %”
Context: 3.07
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 34 %Head Grade: 0.179Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 295' - 345' fresh
- Grind P80
- 9500 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 34 %
- Recovery Basis
- actual_test
- Head Grade
- 0.179
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.3 kg/t
- Lime
- 4.5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 34% from fresh rock is below weak for a heap leach project, indicating significant processing challenges, especially with 1.62% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“34 %”
Context: 0.179
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 38 %Head Grade: 3.37Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 295' - 345' fresh
- Grind P80
- 9500 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 38 %
- Recovery Basis
- actual_test
- Head Grade
- 3.37
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.3 kg/t
- Lime
- 4.5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 38% from fresh rock is below weak for a heap leach project, indicating significant processing challenges, especially with 1.62% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“38 %”
Context: 3.37
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 47 %Head Grade: 0.133Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 295' - 345' fresh (pulverized)
- Leach Time
- 96 hours
Recovery
- Recovery
- 47 %
- Recovery Basis
- actual_test
- Head Grade
- 0.133
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 1.6 kg/t
- Lime
- 5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 47% from pulverized fresh rock is weak for a heap leach project, indicating potential processing challenges despite finer grinding and the presence of 1.62% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“47 %”
Context: 0.133
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 58 %Head Grade: 3.03Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-007 dacite autobreccia 295' - 345' fresh (pulverized)
- Leach Time
- 96 hours
Recovery
- Recovery
- 58 %
- Recovery Basis
- actual_test
- Head Grade
- 3.03
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 1.6 kg/t
- Lime
- 5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 58% from pulverized fresh rock is moderate for a heap leach project, indicating acceptable processing characteristics despite the presence of 1.62% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Refractory Ore
- Bench Scale Only
Evidence · table
“58 %”
Context: 3.03
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 22 %Head Grade: 0.338Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-008 dacite lithic tuff 510' - 560' fresh
- Grind P80
- 50000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 22 %
- Recovery Basis
- actual_test
- Head Grade
- 0.338
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.21 kg/t
- Lime
- 2 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 22% from fresh rock is very low for a heap leach project, indicating significant processing challenges, especially with 0.98% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“22 %”
Context: 0.338
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 40 %Head Grade: 9.42Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-008 dacite lithic tuff 510' - 560' fresh
- Grind P80
- 50000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 40 %
- Recovery Basis
- actual_test
- Head Grade
- 9.42
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.21 kg/t
- Lime
- 2 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 40% from fresh rock is below weak for a heap leach project, indicating significant processing challenges, especially with 0.98% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“40 %”
Context: 9.42
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 20 %Head Grade: 0.394Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-008 dacite lithic tuff 510' - 560' fresh
- Grind P80
- 25000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 20 %
- Recovery Basis
- actual_test
- Head Grade
- 0.394
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.21 kg/t
- Lime
- 2 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 20% from fresh rock is very low for a heap leach project, indicating significant processing challenges, especially with 0.98% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“20 %”
Context: 0.394
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 42 %Head Grade: 7.18Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-008 dacite lithic tuff 510' - 560' fresh
- Grind P80
- 25000 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 42 %
- Recovery Basis
- actual_test
- Head Grade
- 7.18
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.21 kg/t
- Lime
- 2 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 42% from fresh rock is weak for a heap leach project, indicating potential processing challenges, especially with 0.98% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“42 %”
Context: 7.18
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 20 %Head Grade: 0.459Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-008 dacite lithic tuff 510' - 560' fresh
- Grind P80
- 9500 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 20 %
- Recovery Basis
- actual_test
- Head Grade
- 0.459
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.21 kg/t
- Lime
- 2 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 20% from fresh rock is very low for a heap leach project, indicating significant processing challenges, especially with 0.98% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“20 %”
Context: 0.459
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 59 %Head Grade: 7.81Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-008 dacite lithic tuff 510' - 560' fresh
- Grind P80
- 9500 µm
- Leach Time
- 336 hours
Recovery
- Recovery
- 59 %
- Recovery Basis
- actual_test
- Head Grade
- 7.81
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.21 kg/t
- Lime
- 2 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 59% from fresh rock is moderate for a heap leach project, indicating acceptable processing characteristics despite the presence of 0.98% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Refractory Ore
- Bench Scale Only
Evidence · table
“59 %”
Context: 7.81
bottle rollRosebud Open-Pit, Heap-Leach Project · goldRecovery: 29 %Head Grade: 0.599Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-008 dacite lithic tuff 510' - 560' fresh (pulverized)
- Leach Time
- 96 hours
Recovery
- Recovery
- 29 %
- Recovery Basis
- actual_test
- Head Grade
- 0.599
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.51 kg/t
- Lime
- 2.5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Gold recovery of 29% from pulverized fresh rock is very low for a heap leach project, indicating significant processing challenges despite finer grinding and the presence of 0.98% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Low Recovery
- Refractory Ore
- Bench Scale Only
Evidence · table
“29 %”
Context: 0.599
bottle rollRosebud Open-Pit, Heap-Leach Project · silverRecovery: 62 %Head Grade: 11.93Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- bottle roll
- Processing Route
- heap leach
- Sample
- BG26-008 dacite lithic tuff 510' - 560' fresh (pulverized)
- Leach Time
- 96 hours
Recovery
- Recovery
- 62 %
- Recovery Basis
- actual_test
- Head Grade
- 11.93
- Head Grade Unit
- g/t
Reagents
- Cyanide
- 0.51 kg/t
- Lime
- 2.5 kg/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Silver recovery of 62% from pulverized fresh rock is moderate for a heap leach project, indicating acceptable processing characteristics despite the presence of 0.98% sulfide sulfur. This is a preliminary bottle roll test.
Negative factors
- Refractory Ore
- Bench Scale Only
Evidence · table
“62 %”
Context: 11.93
cyanide shake testRosebud Open-Pit, Heap-Leach Project · goldRecovery: 86 %Head Grade: 0.533Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-002 130' - 180'
Recovery
- Recovery
- 86 %
- Recovery Basis
- theoretical
- Head Grade
- 0.533
- Head Grade Unit
- g/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Estimated gold extraction of 86% from a cyanide shake test is good, but this is a preliminary theoretical recovery and not a full metallurgical test.
Negative factors
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“86%”
Context: 0.533
cyanide shake testRosebud Open-Pit, Heap-Leach Project · silverRecovery: 78 %Head Grade: 2.91Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-002 130' - 180'
Recovery
- Recovery
- 78 %
- Recovery Basis
- theoretical
- Head Grade
- 2.91
- Head Grade Unit
- g/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Estimated silver extraction of 78% from a cyanide shake test is good, but this is a preliminary theoretical recovery and not a full metallurgical test.
Negative factors
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“78%”
Context: 2.91
cyanide shake testRosebud Open-Pit, Heap-Leach Project · goldRecovery: 55 %Head Grade: 0.182Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-007 95' - 145'
Recovery
- Recovery
- 55 %
- Recovery Basis
- theoretical
- Head Grade
- 0.182
- Head Grade Unit
- g/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Estimated gold extraction of 55% from a cyanide shake test is moderate, but this is a preliminary theoretical recovery and not a full metallurgical test.
Negative factors
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“55%”
Context: 0.182
cyanide shake testRosebud Open-Pit, Heap-Leach Project · silverRecovery: 84 %Head Grade: 1.41Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-007 95' - 145'
Recovery
- Recovery
- 84 %
- Recovery Basis
- theoretical
- Head Grade
- 1.41
- Head Grade Unit
- g/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Estimated silver extraction of 84% from a cyanide shake test is exceptional, but this is a preliminary theoretical recovery and not a full metallurgical test.
Positive factors
- High Recovery
Negative factors
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“84%”
Context: 1.41
cyanide shake testRosebud Open-Pit, Heap-Leach Project · goldRecovery: 28 %Head Grade: 0.213Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-007 195' - 245'
Recovery
- Recovery
- 28 %
- Recovery Basis
- theoretical
- Head Grade
- 0.213
- Head Grade Unit
- g/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Estimated gold extraction of 28% from a cyanide shake test is very low, indicating significant processing challenges. This is a preliminary theoretical recovery and not a full metallurgical test.
Negative factors
- Low Recovery
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“28%”
Context: 0.213
cyanide shake testRosebud Open-Pit, Heap-Leach Project · silverRecovery: 96 %Head Grade: 4.39Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-007 195' - 245'
Recovery
- Recovery
- 96 %
- Recovery Basis
- theoretical
- Head Grade
- 4.39
- Head Grade Unit
- g/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Estimated silver extraction of 96% from a cyanide shake test is exceptional, but this is a preliminary theoretical recovery and not a full metallurgical test.
Positive factors
- High Recovery
Negative factors
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“96%”
Context: 4.39
cyanide shake testRosebud Open-Pit, Heap-Leach Project · goldRecovery: 77 %Head Grade: 0.105Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-007 295' - 345'
Recovery
- Recovery
- 77 %
- Recovery Basis
- theoretical
- Head Grade
- 0.105
- Head Grade Unit
- g/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Estimated gold extraction of 77% from a cyanide shake test is exceptional, but this is a preliminary theoretical recovery and not a full metallurgical test.
Negative factors
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“77%”
Context: 0.105
cyanide shake testRosebud Open-Pit, Heap-Leach Project · silverRecovery: 59 %Head Grade: 2.61Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-007 295' - 345'
Recovery
- Recovery
- 59 %
- Recovery Basis
- theoretical
- Head Grade
- 2.61
- Head Grade Unit
- g/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Estimated silver extraction of 59% from a cyanide shake test is moderate, but this is a preliminary theoretical recovery and not a full metallurgical test.
Negative factors
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“59%”
Context: 2.61
cyanide shake testRosebud Open-Pit, Heap-Leach Project · goldRecovery: 27 %Head Grade: 0.525Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-008 510' - 560'
Recovery
- Recovery
- 27 %
- Recovery Basis
- theoretical
- Head Grade
- 0.525
- Head Grade Unit
- g/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Estimated gold extraction of 27% from a cyanide shake test is very low, indicating significant processing challenges. This is a preliminary theoretical recovery and not a full metallurgical test.
Negative factors
- Low Recovery
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“27%”
Context: 0.525
cyanide shake testRosebud Open-Pit, Heap-Leach Project · silverRecovery: 76 %Head Grade: 9.81Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-008 510' - 560'
Recovery
- Recovery
- 76 %
- Recovery Basis
- theoretical
- Head Grade
- 9.81
- Head Grade Unit
- g/t
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Estimated silver extraction of 76% from a cyanide shake test is exceptional, but this is a preliminary theoretical recovery and not a full metallurgical test.
Negative factors
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“76%”
Context: 9.81
cyanide shake testRosebud Open-Pit, Heap-Leach Project · goldRecovery: 100 %Head Grade: 0.525Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-008 510' - 560' (Roast)
Recovery
- Recovery
- 100 %
- Recovery Basis
- theoretical
- Head Grade
- 0.525
- Head Grade Unit
- g/t
Reagents
- Reagent Notes
- Roast conducted at 650C for 2 hours
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Roasting the sample resulted in over 100% estimated gold extraction, indicating a potential solution for the refractory nature of this material, though it implies a more complex processing route. This is a preliminary theoretical recovery.
Positive factors
- Recovery Improving
Negative factors
- Refractory Ore
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“<100%”
Context: 0.525
cyanide shake testRosebud Open-Pit, Heap-Leach Project · silverRecovery: 22 %Head Grade: 9.81Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Rosebud Open-Pit, Heap-Leach Project
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- BGAU
Test Work
- Program Status
- scoping
- Test Type
- cyanide shake test
- Processing Route
- heap leach
- Sample
- BG26-008 510' - 560' (Roast)
Recovery
- Recovery
- 22 %
- Recovery Basis
- theoretical
- Head Grade
- 9.81
- Head Grade Unit
- g/t
Reagents
- Reagent Notes
- Roast conducted at 650C for 2 hours
Lab
- Laboratory
- Kappes, Cassiday and Associates of Reno
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-08-27T00:00:00.000Z
Reasoning: Estimated silver extraction of 22% from the roasted sample is very low, indicating that roasting did not improve silver recovery and the material remains challenging. This is a preliminary theoretical recovery.
Negative factors
- Low Recovery
- Refractory Ore
- Theoretical Recovery Only
- Bench Scale Only
Evidence · table
“22%”
Context: 9.81
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.