TOCVAN REPORTS POSITIVE CLOSED-CIRCUIT COLUMN LEACH RESULTS AT GRAN PILAR
Original announcement by cse on
- Company
- Tocvan Ventures Corp.
- Ticker
- TOC
- Exchange
- CSE
- Region
- Sonora, Mexico
- Primary commodity
- Gold
- Secondary commodities
- Silver, Copper
- Document categories
- Metallurgy
- Extracted
- 2026-09-30 23:03:09 UTC
Analysis by Minestarters Atlas
Atlas analysis published:
Minestarters Atlas analysis
Summary
Tocvan Ventures has reported positive closed-circuit column leach results for the Gran Pilar Gold-Silver Project, achieving up to 82.3% gold and 58.0% silver extraction. The tests indicate that a finer crush (P80 3/8") optimizes recovery and that non-agglomerated ore is more efficient due to lower cyanide consumption. These results support the company's planned 50,000-tonne heap-leach pilot facility.
Reasoning: The column leach results demonstrate strong gold and silver recoveries (up to 82% Au and 58% Ag) using a heap-leach route, which is a significant de-risking milestone for the upcoming 50,000-tonne pilot facility.
Positive factors
- High gold recovery (up to 82.3%) in column leach
- Finer crush (P80 3/8") significantly improves gold extraction
- Non-agglomerated ore shows lower cyanide consumption
- Results represent a clear improvement over 2023 bulk-sample heap test
- Low copper interference noted
Negative factors
- Agglomeration increases cyanide consumption without material recovery benefit
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 recovery up to 82.25% in column leach is strong for a heap leach route.
Evidence · table
“82.25”
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: The tests were conducted using column leach (heap leach) methodology.
Evidence · text
“closed-circuit column leach metallurgical program”
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: Release mentions LTM is ISO/IEC 17025:2017 and ISO 9001:2015 certified.
Evidence · text
“LTM ISO/IEC 17025:2017 and ISO 9001:2015”
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: Brodie A. Sutherland, a qualified person (QP), has reviewed and approved the technical information.
Evidence · text
“Brodie A. Sutherland... a qualified person ("QP")”
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 leaching")
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: 8. Some facts used in scoring do not have a stored record.
Metallurgical Results (8)
column leachGran Pilar Gold-Silver Project · goldRecovery: 76.41 %View all detailsHide details
Identity
- Project
- Gran Pilar Gold-Silver Project
- Commodity
- gold
- Region
- mexico
- Reported Region
- Sonora, Mexico
- Ticker
- TOC
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- CL-01 3/4" agglomerated column
Recovery
- Recovery
- 76.41 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- Laboratorio Tecnológico de Metalurgia S.A. de C.V.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-30T00:00:00.000Z
Reasoning: Standard recovery for a 3/4" crush size.
Evidence · table
“76.41”
Context: CL-01 3/4" Yes
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: 76.41% is at or above the exceptional band (75%)
column leachGran Pilar Gold-Silver Project · silverRecovery: 52.44 %View all detailsHide details
Identity
- Project
- Gran Pilar Gold-Silver Project
- Commodity
- silver
- Region
- mexico
- Reported Region
- Sonora, Mexico
- Ticker
- TOC
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- CL-01 3/4" agglomerated column
Recovery
- Recovery
- 52.44 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- Laboratorio Tecnológico de Metalurgia S.A. de C.V.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-30T00:00:00.000Z
Reasoning: Standard silver recovery for this crush size.
Evidence · table
“52.44”
Context: CL-01 3/4" Yes
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: 52.44% is below the weak band (75%)
column leachGran Pilar Gold-Silver Project · goldRecovery: 75.36 %View all detailsHide details
Identity
- Project
- Gran Pilar Gold-Silver Project
- Commodity
- gold
- Region
- mexico
- Reported Region
- Sonora, Mexico
- Ticker
- TOC
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- CL-02 3/4" non-agglomerated column
Recovery
- Recovery
- 75.36 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- Laboratorio Tecnológico de Metalurgia S.A. de C.V.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-30T00:00:00.000Z
Reasoning: Standard recovery for a 3/4" crush size.
Evidence · table
“75.36”
Context: CL-02 3/4" No
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: 75.36% is at or above the exceptional band (75%)
column leachGran Pilar Gold-Silver Project · silverRecovery: 49.12 %View all detailsHide details
Identity
- Project
- Gran Pilar Gold-Silver Project
- Commodity
- silver
- Region
- mexico
- Reported Region
- Sonora, Mexico
- Ticker
- TOC
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- CL-02 3/4" non-agglomerated column
Recovery
- Recovery
- 49.12 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- Laboratorio Tecnológico de Metalurgia S.A. de C.V.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-30T00:00:00.000Z
Reasoning: Standard silver recovery for this crush size.
Evidence · table
“49.12”
Context: CL-02 3/4" No
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: 49.12% is below the weak band (75%)
column leachGran Pilar Gold-Silver Project · goldRecovery: 81.63 %View all detailsHide details
Identity
- Project
- Gran Pilar Gold-Silver Project
- Commodity
- gold
- Region
- mexico
- Reported Region
- Sonora, Mexico
- Ticker
- TOC
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- CL-03 3/8" agglomerated column
Recovery
- Recovery
- 81.63 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- Laboratorio Tecnológico de Metalurgia S.A. de C.V.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-30T00:00:00.000Z
Reasoning: Strong gold recovery achieved with the 3/8" crush size.
Positive factors
- High gold recovery with finer crush
Evidence · table
“81.63”
Context: CL-03 3/8" Yes
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: 81.63% is at or above the exceptional band (75%)
column leachGran Pilar Gold-Silver Project · silverRecovery: 54.84 %View all detailsHide details
Identity
- Project
- Gran Pilar Gold-Silver Project
- Commodity
- silver
- Region
- mexico
- Reported Region
- Sonora, Mexico
- Ticker
- TOC
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- CL-03 3/8" agglomerated column
Recovery
- Recovery
- 54.84 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- Laboratorio Tecnológico de Metalurgia S.A. de C.V.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-30T00:00:00.000Z
Reasoning: Strong silver recovery achieved with the 3/8" crush size.
Positive factors
- High silver recovery with finer crush
Evidence · table
“54.84”
Context: CL-03 3/8" Yes
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: 54.84% is below the weak band (75%)
column leachGran Pilar Gold-Silver Project · goldRecovery: 82.25 %View all detailsHide details
Identity
- Project
- Gran Pilar Gold-Silver Project
- Commodity
- gold
- Region
- mexico
- Reported Region
- Sonora, Mexico
- Ticker
- TOC
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- CL-04 3/8" non-agglomerated column
Recovery
- Recovery
- 82.25 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- Laboratorio Tecnológico de Metalurgia S.A. de C.V.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-30T00:00:00.000Z
Reasoning: Highest gold recovery achieved in the program using the 3/8" crush size without agglomeration.
Positive factors
- Exceptional gold recovery with finer crush and no agglomeration
Evidence · table
“82.25”
Context: CL-04 3/8" No
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: 82.25% is at or above the exceptional band (75%)
column leachGran Pilar Gold-Silver Project · silverRecovery: 57.99 %View all detailsHide details
Identity
- Project
- Gran Pilar Gold-Silver Project
- Commodity
- silver
- Region
- mexico
- Reported Region
- Sonora, Mexico
- Ticker
- TOC
Test Work
- Program Status
- detailed
- Test Type
- column leach
- Processing Route
- heap leach
- Sample
- CL-04 3/8" non-agglomerated column
Recovery
- Recovery
- 57.99 %
- Recovery Basis
- actual_test
Lab
- Laboratory
- Laboratorio Tecnológico de Metalurgia S.A. de C.V.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-30T00:00:00.000Z
Reasoning: Highest silver recovery achieved in the program using the 3/8" crush size without agglomeration.
Positive factors
- High silver recovery with finer crush
Evidence · table
“57.99”
Context: CL-04 3/8" No
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: 57.99% 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.