GR Silver Reports Successful Metallurgical Test Work Results for the Bulk Sampling Test Mining Program at Plomosas Project
Original announcement by tmx on
- Company
- GR Silver Mining Ltd.
- Ticker
- GRSL
- Exchange
- TSX
- Region
- Mexico
- Primary commodity
- Silver
- Secondary commodities
- Gold, Lead, Zinc, Copper
- Document categories
- Metallurgy
- Extracted
- 2026-09-16 03:07:49 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
GR Silver has reported positive metallurgical test work results for the Plomosas Project in Mexico, supporting the design of a pilot plant. The studies, conducted at SGM and SGS laboratories, confirmed high silver and gold recoveries into lead and zinc concentrates with no significant deleterious elements identified.
Reasoning: Successful metallurgical test work demonstrating high recoveries for silver and gold into lead concentrates, supporting pilot plant design for the Plomosas Project.
Positive factors
- High precious metal recoveries in rougher concentrate
- Successful cleaner test work improving gold recovery
- Concentrates within commercial specifications
- No deleterious elements or penalties noted
- QA/QC procedures and QP sign-off disclosed
Negative factors
- Bench-scale tests only (open circuit flotation)
Facts used in scoring: 8
Classification and evidence
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: Gold and silver recoveries in the lead concentrate are high (74% and 86% respectively).
Evidence · text
“Silver and gold recoveries have been developed by the Qualified Person for use in a Preliminary Economic Assessment to be 74% and 86%, respectively.”
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 details specific QA/QC procedures including blanks, duplicates, and standards.
Evidence · text
“The Company has implemented QA/QC procedures, which include the insertion of blank, duplicate, and standard samples”
Bench Scale Onlynegative
Only preliminary bench tests completed — no locked-cycle or pilot work.
Why it applies: The test work was described as bench-scale open circuit flotation tests.
Evidence · text
“The tests conducted were bench-scale open circuit flotation tests.”
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: the document describes a flotation route ("flotation")
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: the document describes a gravity route ("gravity")
Multi-Domain Testedpositive
Variability across ore domains (oxide, transition, fresh) has been addressed.
Why it applies: 3 distinct composites were tested
Extracted facts
Stored fact records: 8. Some facts used in scoring do not have a stored record.
Metallurgical Results (8)
flotationPlomosas Project · silverHead Grade: 109Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Plomosas Project
- Commodity
- silver
- Region
- mexico
- Reported Region
- Mexico
- Ticker
- GRSL
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- flotation
- Sample
- SGS composite feed sample
Recovery
- Head Grade
- 109
- Head Grade Unit
- g/t
Lab
- Laboratory
- SGS Mexico
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-05T00:00:00.000Z
Reasoning: High-grade silver feed grade confirmed in composite sample.
Evidence · table
“109”
Context: SGS
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
flotationPlomosas Project · goldHead Grade: 2.69Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Plomosas Project
- Commodity
- gold
- Region
- mexico
- Reported Region
- Mexico
- Ticker
- GRSL
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- flotation
- Sample
- SGS composite feed sample
Recovery
- Head Grade
- 2.69
- Head Grade Unit
- g/t
Lab
- Laboratory
- SGS Mexico
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-05T00:00:00.000Z
Reasoning: High-grade gold feed grade confirmed in composite sample.
Evidence · table
“2.69”
Context: SGS
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
flotationPlomosas Project · silverHead Grade: 105Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Plomosas Project
- Commodity
- silver
- Region
- mexico
- Reported Region
- Mexico
- Ticker
- GRSL
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- flotation
- Sample
- SGM composite feed sample
Recovery
- Head Grade
- 105
- Head Grade Unit
- g/t
Lab
- Laboratory
- SGM
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-05T00:00:00.000Z
Reasoning: High-grade silver feed grade confirmed in composite sample.
Evidence · table
“105”
Context: SGM
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
flotationPlomosas Project · goldHead Grade: 2.7Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Plomosas Project
- Commodity
- gold
- Region
- mexico
- Reported Region
- Mexico
- Ticker
- GRSL
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- flotation
- Sample
- SGM composite feed sample
Recovery
- Head Grade
- 2.7
- Head Grade Unit
- g/t
Lab
- Laboratory
- SGM
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-05T00:00:00.000Z
Reasoning: High-grade gold feed grade confirmed in composite sample.
Evidence · table
“2.70”
Context: SGM
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
flotationPlomosas Project · silverRecovery: 71.5 %Head Grade: 721Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Plomosas Project
- Commodity
- silver
- Region
- mexico
- Reported Region
- Mexico
- Ticker
- GRSL
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- flotation
- Sample
- Lead Rougher Concentrate
Recovery
- Recovery
- 71.5 %
- Recovery Basis
- actual_test
- Head Grade
- 721
- Head Grade Unit
- g/t
Lab
- Laboratory
- SGM
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-05T00:00:00.000Z
Reasoning: Strong silver recovery reported in rougher stage.
Positive factors
- High silver recovery into lead concentrate
Evidence · table
“721”
Context: 10.06
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 71.5% is below the weak band (75%)
flotationPlomosas Project · goldRecovery: 77.9 %Head Grade: 16Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Plomosas Project
- Commodity
- gold
- Region
- mexico
- Reported Region
- Mexico
- Ticker
- GRSL
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- flotation
- Sample
- Lead Rougher Concentrate
Recovery
- Recovery
- 77.9 %
- Recovery Basis
- actual_test
- Head Grade
- 16
- Head Grade Unit
- g/t
Lab
- Laboratory
- SGM
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-05T00:00:00.000Z
Reasoning: Strong gold recovery reported in rougher stage.
Positive factors
- High gold recovery into lead concentrate
Evidence · table
“16”
Context: 10.06
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 77.9% is below the weak band (80%)
flotationPlomosas Project · goldRecovery: 86 %Head Grade: 22.75Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Plomosas Project
- Commodity
- gold
- Region
- mexico
- Reported Region
- Mexico
- Ticker
- GRSL
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- flotation
- Sample
- Lead Concentrate (Cleaner)
Recovery
- Recovery
- 86 %
- Recovery Basis
- actual_test
- Head Grade
- 22.75
- Head Grade Unit
- g/t
Lab
- Laboratory
- SGM
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-05T00:00:00.000Z
Reasoning: Cleaner stage significantly improves gold recovery.
Positive factors
- Successful increase in gold recovery vs 2021 test work
Evidence · table
“22.75”
Context: 5.5
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
flotationPlomosas Project · silverRecovery: 74 %Head Grade: 839Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Plomosas Project
- Commodity
- silver
- Region
- mexico
- Reported Region
- Mexico
- Ticker
- GRSL
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- flotation
- Sample
- Lead Concentrate (Cleaner)
Recovery
- Recovery
- 74 %
- Recovery Basis
- actual_test
- Head Grade
- 839
- Head Grade Unit
- g/t
Lab
- Laboratory
- SGM
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-05T00:00:00.000Z
Reasoning: High silver grade and recovery in cleaner stage.
Positive factors
- High silver recovery in cleaner concentrate
Evidence · table
“839”
Context: 5.5
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 74% 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.