# Zacatecas Silver Expands Oso Negro to Over 3 Kilometres of Mapped Gold-Silver Veins; Phase Two Rock Chip Sampling Returns up to 20.3 g/t Gold and 3,480 g/t Silver

Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/zacatecas-silver-expands-oso-negro-to-over-3-kilometres-of-mapped-gold-silver-ve--76ac472f-c631-46f4-97eb-4cb5f2b0816c

Original source: https://orestocks.com/company/ZAC.V/press-releases/6745094489866508

Publisher: orestocks

Original announcement: 2026-09-10T10:30:00.000Z

Analysis by Minestarters Atlas

Atlas analysis published: Unknown date

Atlas analysis updated: Unknown date

- Company: Zacatecas Silver Corp.

- Ticker: ZAC.V

- Exchange: Unavailable

- Region: Sonora, Mexico

- Primary commodity: Gold

- Secondary commodities: Silver, Lead, Zinc

- Document categories: Metallurgy, Drill results, Other

- Extracted: 2026-09-10 12:01:38 UTC

Narrative sentiment: 0.80 · Bullish

## Minestarters Atlas summary

Zacatecas Silver has expanded the mapped vein system at the Oso Negro project in Sonora, Mexico, to over 3 kilometres. Phase Two rock chip sampling returned high-grade intercepts of up to 20.3 g/t gold and 3,480 g/t silver, confirming continuous mineralization along the Prospecto vein.

Reasoning: Phase Two rock chip sampling significantly expanded the mapped vein system and returned high-grade gold and silver intercepts, confirming the potential of an undrilled epithermal target.

- Positive factor: High-grade rock chip intercepts

- Positive factor: System expansion to 3km strike

- Positive factor: Continuous mineralization confirmed

- Positive factor: Drill-ready status

Facts used in scoring: 2

## Classification and evidence

**Step-Out Extension**

Polarity: positive

Definition: Mineralization extended beyond the previously known limit.

Why it applies: Mapped vein strike length extended from 2km to over 3km.

Evidence · text

> Mapped vein strike length has been extended to over 3 kilometres, up from the 2 kilometres reported after Phase One

**QA/QC Disclosed**

Polarity: positive

Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\).

Why it applies: Release mentions use of certified reference materials, blanks, and field duplicates.

Evidence · text

> The Company inserted certified reference materials, blanks and field duplicates into the sample stream

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: the document describes a mill\_cil route \("CIP"\)

**Single Domain Only**

Polarity: negative

Definition: Testing limited to one composite or domain — representativeness not established.

Why it applies: only one composite was tested

## Extracted facts

Stored fact records: 2. Some facts used in scoring do not have a stored record.

## Metallurgical Results (2)

### Fact 1

[Link to this fact](https://atlas-staging.minestarters.com/news/zacatecas-silver-expands-oso-negro-to-over-3-kilometres-of-mapped-gold-silver-ve--76ac472f-c631-46f4-97eb-4cb5f2b0816c#fact-metallurgical-facts-0)

Oso Negro · gold

#### Identity

- Project: Oso Negro
- Commodity: gold
- Region: mexico
- Reported Region: Sonora, Mexico
- Ticker: ZAC.V

#### Test Work

- Sample: Phase Two rock chip grab samples

#### Lab

- Laboratory: ALS

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2026-09-10T00:00:00.000Z

Reasoning: 20.3 g/t gold is a very strong intercept for surface rock chip sampling in an epithermal system.

- Positive factor: High grade for rock chip

Evidence · text

> Phase Two returned individual grab samples grading up to 20.3 g/t gold

### Fact 2

[Link to this fact](https://atlas-staging.minestarters.com/news/zacatecas-silver-expands-oso-negro-to-over-3-kilometres-of-mapped-gold-silver-ve--76ac472f-c631-46f4-97eb-4cb5f2b0816c#fact-metallurgical-facts-1)

Oso Negro · silver

#### Identity

- Project: Oso Negro
- Commodity: silver
- Region: mexico
- Reported Region: Sonora, Mexico
- Ticker: ZAC.V

#### Test Work

- Sample: Phase Two rock chip grab samples

#### Lab

- Laboratory: ALS

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2026-09-10T00:00:00.000Z

Reasoning: 3,480 g/t silver is an exceptional grade for surface grab samples.

- Positive factor: High grade for rock chip

Evidence · text

> 3,480 g/t silver

## 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.