Liberty Gold Validates Predicted Operating Gold Leach Recoveries Through Bulk Column Tests at Run-of-Mine Sizing
Original announcement by prospectors_exchange on
- Company
- Liberty Gold Corp.
- Ticker
- LGD
- Exchange
- Unavailable
- Region
- Idaho
- Primary commodity
- Gold
- Secondary commodities
- Silver
- Document categories
- Metallurgy
- Extracted
- 2026-09-18 12:49:33 UTC
Analysis by Minestarters Atlas
Atlas analysis published:
Minestarters Atlas analysis
Summary
Liberty Gold has completed Phase 6 metallurgical bulk column testing at the Black Pine Oxide Gold Project, validating predicted gold leach recoveries for run-of-mine (ROM) sized material. The results show that gold extraction is relatively insensitive to particle size, supporting a low-cost heap leach operation without extensive crushing.
Reasoning: Bulk column tests at ROM sizing successfully validated the gold recovery models used in the Feasibility Study, specifically demonstrating that coarse particle sizes achieve high extractions, which supports a low-cost heap leach strategy.
Positive factors
- Validation of ROM heap leach recoveries
- Rapid leach kinetics (90% in 36 days)
- Low sensitivity to particle size (reduces crushing costs)
- High extraction in Rangefront Ppos sample (95%)
- Favorable permeability results
Negative factors
- One sample underperformed due to high clay content
Facts used in scoring: 4
Classification and evidence
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: Rangefront Ppos sample achieved 95% gold extraction.
Evidence · text
“The Rangefront Ppos sample had the highest extraction tested at 95%”
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: The testing was conducted to validate a ROM heap leach processing route.
Evidence · text
“support a ROM heap leach processing route”
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 release was reviewed and approved by Richard Zaggle, a Qualified Person.
Evidence · text
“reviewed and approved by Richard Zaggle, RM-SME, Senior Director, Mining and Metallurgy of Liberty Gold Corp., a Qualified Person”
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: the document describes a heap_leach route ("heap leach")
Multi-Domain Testedpositive
Variability across ore domains (oxide, transition, fresh) has been addressed.
Why it applies: 4 distinct composites were tested
Extracted facts
Stored fact records: 4. Some facts used in scoring do not have a stored record.
Metallurgical Results (4)
column leachBlack Pine · goldRecovery: 72.4 %View all detailsHide details
Identity
- Project
- Black Pine
- Commodity
- gold
- Region
- usa_id
- Reported Region
- Idaho
- Ticker
- LGD
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- ROM heap leach
- Sample
- average weighted gold extraction for the bulk columns
Recovery
- Recovery
- 72.4 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- KCA
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-17T00:00:00.000Z
Reasoning: Average weighted recovery of 72.4% matches previous modeling.
Positive factors
- In line with modeled recoveries in the recent FS
Evidence · text
“The average weighted gold extraction for the bulk columns was 72.4%, which is in line with modeled recoveries in the recent FS.”
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 leachBlack Pine · goldRecovery: 95 %Head Grade: 0.43Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Black Pine
- Commodity
- gold
- Region
- usa_id
- Reported Region
- Idaho
- Ticker
- LGD
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- ROM heap leach
- Sample
- Rangefront Ppos sample
Recovery
- Recovery
- 95 %
- Recovery Basis
- actual_test
- Head Grade
- 0.43
- Head Grade Unit
- g/t
Lab
- Laboratory
- KCA
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-17T00:00:00.000Z
Reasoning: Exceptional recovery of 95% at a low head grade of 0.43 g/t Au.
Positive factors
- Outperformed modeled gold recoveries by over 13%
- High recovery for low grade material
Evidence · text
“The Rangefront Ppos sample had the highest extraction tested at 95% for a 0.43 g/t gold head grade.”
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: 95% is at or above the exceptional band (75%)
column leachBlack Pine · goldRecovery: 51.9 %View all detailsHide details
Identity
- Project
- Black Pine
- Commodity
- gold
- Region
- usa_id
- Reported Region
- Idaho
- Ticker
- LGD
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- ROM heap leach
- Sample
- I-pit Pold sample
Recovery
- Recovery
- 51.9 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- KCA
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-17T00:00:00.000Z
Reasoning: Lower recovery of 51.9% was expected for this specific rock unit.
Positive factors
- Aligned with modeled recoveries
Negative factors
- Lower extraction compared to other samples
Evidence · text
“The I-pit Pold sample extraction at 51.9% was an expected result as this rock unit is known to have lower gold extraction”
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 leachBlack Pine · silverRecovery: 21 %View all detailsHide details
Identity
- Project
- Black Pine
- Commodity
- silver
- Region
- usa_id
- Reported Region
- Idaho
- Ticker
- LGD
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- ROM heap leach
- Sample
- bulk column leach tests (weighted average)
Recovery
- Recovery
- 21 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- KCA
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-17T00:00:00.000Z
Reasoning: Silver recovery of 21% is higher than previous averages and will be used for model updates.
Positive factors
- Above previous variability composite averages
Evidence · text
“Silver Bulk column leach tests recorded silver (“Ag”) extractions up to 39%, with a weighted average Ag recovery of 21%.”
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: 21% 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.