# TOCVAN REPORTS POSITIVE CLOSED-CIRCUIT COLUMN LEACH RESULTS AT GRAN PILAR

Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/tocvan-reports-positive-closed-circuit-column-leach-results-at-gran-pilar--dfb13a08-84b5-4a22-b0d3-485b17f8bfe9

Original source: https://webfiles-primary.thecse.com/news_releases/neutral/798/a12f1413-1d41-439a-9f73-e4a0ef2a6f90

Publisher: cse

Original announcement: 2026-09-30T22:04:15.000Z

Analysis by Minestarters Atlas

Atlas analysis published: 2026-09-30T23:03:09.086Z

Atlas analysis updated: 2026-09-30T23:03:09.086Z

- 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

Narrative sentiment: 0.70 · Bullish

## Minestarters Atlas 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 factor: High gold recovery \(up to 82.3%\) in column leach

- Positive factor: Finer crush \(P80 3/8"\) significantly improves gold extraction

- Positive factor: Non-agglomerated ore shows lower cyanide consumption

- Positive factor: Results represent a clear improvement over 2023 bulk-sample heap test

- Positive factor: Low copper interference noted

- Negative factor: Agglomeration increases cyanide consumption without material recovery benefit

Facts used in scoring: 8

## Classification and evidence

**High Recovery**

Polarity: positive

Definition: 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 Route**

Polarity: neutral

Definition: 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 Disclosed**

Polarity: positive

Story-specific tag

Definition: 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 Signed**

Polarity: positive

Story-specific tag

Definition: 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 Route**

Polarity: neutral

Definition: 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 Tested**

Polarity: positive

Definition: 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 leach

[Link to this fact](https://atlas-staging.minestarters.com/news/tocvan-reports-positive-closed-circuit-column-leach-results-at-gran-pilar--dfb13a08-84b5-4a22-b0d3-485b17f8bfe9#fact-metallurgical-facts-0)

Gran Pilar Gold-Silver Project · gold

#### 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 Route**

Polarity: neutral

Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.

Why it applies: processing\_route matches the heap\_leach signal

**High Recovery**

Polarity: positive

Definition: 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 leach

[Link to this fact](https://atlas-staging.minestarters.com/news/tocvan-reports-positive-closed-circuit-column-leach-results-at-gran-pilar--dfb13a08-84b5-4a22-b0d3-485b17f8bfe9#fact-metallurgical-facts-1)

Gran Pilar Gold-Silver Project · silver

#### 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 Route**

Polarity: neutral

Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.

Why it applies: processing\_route matches the heap\_leach signal

**Low Recovery**

Polarity: negative

Definition: Recovery below the weak band for the commodity and processing route.

Why it applies: 52.44% is below the weak band \(75%\)

### column leach

[Link to this fact](https://atlas-staging.minestarters.com/news/tocvan-reports-positive-closed-circuit-column-leach-results-at-gran-pilar--dfb13a08-84b5-4a22-b0d3-485b17f8bfe9#fact-metallurgical-facts-2)

Gran Pilar Gold-Silver Project · gold

#### 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 Route**

Polarity: neutral

Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.

Why it applies: processing\_route matches the heap\_leach signal

**High Recovery**

Polarity: positive

Definition: 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 leach

[Link to this fact](https://atlas-staging.minestarters.com/news/tocvan-reports-positive-closed-circuit-column-leach-results-at-gran-pilar--dfb13a08-84b5-4a22-b0d3-485b17f8bfe9#fact-metallurgical-facts-3)

Gran Pilar Gold-Silver Project · silver

#### 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 Route**

Polarity: neutral

Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.

Why it applies: processing\_route matches the heap\_leach signal

**Low Recovery**

Polarity: negative

Definition: Recovery below the weak band for the commodity and processing route.

Why it applies: 49.12% is below the weak band \(75%\)

### column leach

[Link to this fact](https://atlas-staging.minestarters.com/news/tocvan-reports-positive-closed-circuit-column-leach-results-at-gran-pilar--dfb13a08-84b5-4a22-b0d3-485b17f8bfe9#fact-metallurgical-facts-4)

Gran Pilar Gold-Silver Project · gold

#### 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 factor: High gold recovery with finer crush

Evidence · table

> 81.63

Context: CL-03 3/8" Yes

#### Tags used in scoring

**Heap Leach Route**

Polarity: neutral

Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.

Why it applies: processing\_route matches the heap\_leach signal

**High Recovery**

Polarity: positive

Definition: 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 leach

[Link to this fact](https://atlas-staging.minestarters.com/news/tocvan-reports-positive-closed-circuit-column-leach-results-at-gran-pilar--dfb13a08-84b5-4a22-b0d3-485b17f8bfe9#fact-metallurgical-facts-5)

Gran Pilar Gold-Silver Project · silver

#### 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 factor: High silver recovery with finer crush

Evidence · table

> 54.84

Context: CL-03 3/8" Yes

#### Tags used in scoring

**Heap Leach Route**

Polarity: neutral

Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.

Why it applies: processing\_route matches the heap\_leach signal

**Low Recovery**

Polarity: negative

Definition: Recovery below the weak band for the commodity and processing route.

Why it applies: 54.84% is below the weak band \(75%\)

### column leach

[Link to this fact](https://atlas-staging.minestarters.com/news/tocvan-reports-positive-closed-circuit-column-leach-results-at-gran-pilar--dfb13a08-84b5-4a22-b0d3-485b17f8bfe9#fact-metallurgical-facts-6)

Gran Pilar Gold-Silver Project · gold

#### 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 factor: 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 Route**

Polarity: neutral

Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.

Why it applies: processing\_route matches the heap\_leach signal

**High Recovery**

Polarity: positive

Definition: 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 leach

[Link to this fact](https://atlas-staging.minestarters.com/news/tocvan-reports-positive-closed-circuit-column-leach-results-at-gran-pilar--dfb13a08-84b5-4a22-b0d3-485b17f8bfe9#fact-metallurgical-facts-7)

Gran Pilar Gold-Silver Project · silver

#### 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 factor: High silver recovery with finer crush

Evidence · table

> 57.99

Context: CL-04 3/8" No

#### Tags used in scoring

**Heap Leach Route**

Polarity: neutral

Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.

Why it applies: processing\_route matches the heap\_leach signal

**Low Recovery**

Polarity: negative

Definition: 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.