# 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-extractions.minestarters.com/news/zacatecas-silver-expands-oso-negro-to-over-3-kilometres-of-mapped-gold-silver-ve--c289f5a7-feb5-4ace-b304-c3536b244ba0 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: 2026-09-12 00:48:32 UTC Narrative sentiment: 0.80 · Bullish ## Minestarters Atlas summary Zacatecas Silver reported high-grade rock chip sampling results from Phase Two at the Oso Negro project in Sonora, Mexico, with gold up to 20.3 g/t and silver up to 3,480 g/t. The program extended the mapped vein system to over 3 kilometres and confirmed continuous mineralization along the 600-metre Prospecto vein. Reasoning: Phase Two rock chip sampling returned high-grade gold and silver intercepts and extended the mapped vein system to over 3km, confirming continuity along the Prospecto vein. - Positive factor: High-grade surface intercepts - Positive factor: System expansion - Positive factor: QA/QC disclosed - Positive factor: Continuous mineralization Facts used in scoring: 2 ## Classification and evidence **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: The release mentions the 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 **Step-Out Extension** Polarity: positive Definition: Mineralization extended beyond the previously known limit. Why it applies: Mapped vein strike length was extended from 2 km to over 3 km. Evidence · text > Mapped vein strike length has been extended to over 3 kilometres ## 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-extractions.minestarters.com/news/zacatecas-silver-expands-oso-negro-to-over-3-kilometres-of-mapped-gold-silver-ve--c289f5a7-feb5-4ace-b304-c3536b244ba0#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 - 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 #### Deleterious - Deleterious Flag: No #### 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 a high-grade intercept for an epithermal system. - Positive factor: Bonanza Intercept Evidence · text > individual grab samples grading up to 20.3 g/t gold #### 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 #### Rejected tags **Bonanza Intercept** — Rejected; excluded from scoring Polarity: positive Definition: Exceptionally high-grade zone, well above the deposit-type norm. Reason: 20.3 g/t gold is a high-grade intercept for an epithermal system. Evidence · text > up to 20.3 g/t gold ### Fact 2 [Link to this fact](https://atlas-extractions.minestarters.com/news/zacatecas-silver-expands-oso-negro-to-over-3-kilometres-of-mapped-gold-silver-ve--c289f5a7-feb5-4ace-b304-c3536b244ba0#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 - 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 #### Deleterious - Deleterious Flag: No #### 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. - Positive factor: Bonanza Intercept Evidence · text > 3,480 g/t silver #### 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 #### Rejected tags **Bonanza Intercept** — Rejected; excluded from scoring Polarity: positive Definition: Exceptionally high-grade zone, well above the deposit-type norm. Reason: 3,480 g/t silver is an exceptionally high-grade intercept. 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.