# 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--9d009868-2ab7-4a50-8cda-8fefc522f44e Original source: https://www.globenewswire.com/news-release/2026/09/10/3359299/0/en/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.html Publisher: globenewswire Original announcement: 2026-09-10T00:00:00.000Z Analysis by Minestarters Atlas Atlas analysis published: Unknown date Atlas analysis updated: Unknown date - Company: Zacatecas Silver Corp. - Ticker: ZAC - Exchange: Unavailable - Region: Sonora, Mexico - Primary commodity: Gold - Secondary commodities: Silver, Lead, Zinc - Document categories: Drill results, Other - Extracted: 2026-09-10 12:43:18 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 extended the mapped vein system from 2km to over 3km and returned high-grade gold and silver intercepts. - Positive factor: Step-Out Extension - Positive factor: Bonanza Intercept - Positive factor: QA/QC Disclosed 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 **Bonanza Intercept** Polarity: positive Definition: Exceptionally high-grade zone, well above the deposit-type norm. Why it applies: Returned high-grade intercepts of 20.3 g/t gold and 3,480 g/t silver. Evidence · text > grading up to 20.3 g/t gold and 3,480 g/t silver **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: Company inserted 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 \("CIP"\) ## Extracted facts Stored fact records: 2. Some facts used in scoring do not have a stored record. ## Drill 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--9d009868-2ab7-4a50-8cda-8fefc522f44e#fact-drill-facts-0) Oso Negro · gold #### Identity - Project: Oso Negro - Commodity: gold - Region: mexico - Reported Region: Sonora, Mexico - Ticker: ZAC #### Geometry - Grade: 20.3 - Grade Unit: g/t #### Classification - Deposit Type: epithermal - Program: exploration - Sample Type: surface #### Location - Location: Oso Negro - Loc. Source: document #### QA/QC - Laboratory: ALS - QA/QC Disclosed: Yes - Lab Certified: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: 20.3 g/t gold is an exceptionally high-grade intercept for an epithermal system. - Positive factor: Bonanza Intercept #### Tags used in scoring **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: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated ### 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--9d009868-2ab7-4a50-8cda-8fefc522f44e#fact-drill-facts-1) Oso Negro · silver #### Identity - Project: Oso Negro - Commodity: silver - Region: mexico - Reported Region: Sonora, Mexico - Ticker: ZAC #### Geometry - Grade: 3480 - Grade Unit: g/t #### Classification - Deposit Type: epithermal - Program: exploration - Sample Type: surface #### Location - Location: Oso Negro - Loc. Source: document #### QA/QC - Laboratory: ALS - QA/QC Disclosed: Yes - Lab Certified: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-10T00:00:00.000Z Reasoning: 3,480 g/t silver is an exceptionally high-grade intercept for an epithermal system. - Positive factor: Bonanza Intercept #### Tags used in scoring **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: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated ## 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.