# Antimony Mining News in Utah Canonical page: https://atlas-staging.minestarters.com/news?commodities=antimony®ions=usa_ut Atlas summarizes and classifies mining-industry stories from third-party publishers. Follow each source link for the original reporting. Results: 3 Returned: 3 Coverage: drill results, resource updates, and metallurgy; primary commodity matching; all time unless dates are supplied. Region: Utah (usa_ut) Commodity: Antimony (antimony) Applied filters: {"regions":["usa_ut"],"commodities":["antimony"],"commodity_scope":"primary","document_types":["drill_results","resource_update","metallurgy"],"document_type_match":"any"} Sort: published_at desc Offset: 0; page size: 10 ## American Tungsten & Antimony drilling backs US mine-to-metal plan - Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/american-tungsten-antimony-drilling-backs-us-mine-to-metal-plan--92684636-4e3a-417e-abee-d3c0740d100a) · [Markdown](https://atlas-staging.minestarters.com/news/american-tungsten-antimony-drilling-backs-us-mine-to-metal-plan--92684636-4e3a-417e-abee-d3c0740d100a.md) - Original announcement: 2026-10-15T03:55:25.000Z - Atlas analysis published: 2026-10-15T05:03:39.232Z - Atlas analysis updated: 2026-10-15T05:03:39.232Z - Company: American Tungsten & Antimony (AT4) - Original source: [stockhead](https://stockhead.com.au/resources/american-tungsten-antimony-drilling-backs-us-mine-to-metal-plan/) - Atlas sentiment: 0.649 - Atlas tags: Bonanza Intercept, Step-Out Extension American Tungsten & Antimony's drilling at the Antimony Canyon project in Utah has confirmed a second high-grade antimony pod at the Little Emma prospect. Additionally, rock chip sampling at White Spar returned silver grades up to 432 g/t, potentially adding a silver stream to their processing plans. ## Heliostar Samples High Grade Antimony with Gold and Commences Drilling at Goldstrike Project, Utah - Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/heliostar-samples-high-grade-antimony-with-gold-and-commences-drilling-at-goldst--5f1164a6-9633-49cf-8948-02054a96565b) · [Markdown](https://atlas-staging.minestarters.com/news/heliostar-samples-high-grade-antimony-with-gold-and-commences-drilling-at-goldst--5f1164a6-9633-49cf-8948-02054a96565b.md) - Original announcement: 2026-08-20T09:30:00.000Z - Atlas analysis published: Unknown date - Atlas analysis updated: Unknown date - Company: Heliostar Metals Ltd. (HSTR) - Original source: [investingnews](https://investingnews.com/heliostar-samples-high-grade-antimony-with-gold-and-commences-drilling-at-goldstrike-project-utah/) - Atlas sentiment: 0.732 - Atlas tags: QA/QC Disclosed, Step-Out Extension, Exploration Drilling Heliostar Metals Ltd. announced high-grade antimony and gold channel sample results from its Goldstrike Project in Utah, including 2.53% antimony and 0.61 g/t gold over 1.3m true width. The program confirmed high grades at Antimony Ridge and discovered a new zone at Antimony Knoll, expanding the known Carlin-style system. Following these positive surface results, the company has commenced an RC drill program targeting both areas, with assay results expected in Q4 2026. ## Ataa Project Yields First Antimony Ingots Marking Key Milestone - Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/ataa-project-yields-first-antimony-ingots-marking-key-milestone--e1ce722f-0223-4b12-a9f6-4f0102322753) · [Markdown](https://atlas-staging.minestarters.com/news/ataa-project-yields-first-antimony-ingots-marking-key-milestone--e1ce722f-0223-4b12-a9f6-4f0102322753.md) - Original announcement: 2026-07-30T14:24:29.000Z - Atlas analysis published: Unknown date - Atlas analysis updated: Unknown date - Company: American Tungsten & Antimony - Original source: [canadianminingjournal](https://www.canadianminingjournal.com/news/ataa-project-yields-first-antimony-ingots-marking-key-milestone/) - Atlas sentiment: 0.514 - Atlas tags: Mill Route American Tungsten & Antimony (ATAA) has successfully produced its first antimony ingots from hand-sorted stibnite at the Antimony Canyon project in Utah. The smelting was supported by XPS, a Glencore subsidiary, and serves as a metallurgical milestone to demonstrate the project's mine-to-metal potential. # Atlas tag definitions - **Bonanza Intercept:** Exceptionally high-grade zone, well above the deposit-type norm. - **True Width Disclosed:** Actual thickness perpendicular to structure is stated, not just downhole length. - **Step-Out Extension:** Mineralization extended beyond the previously known limit. - **QA/QC Disclosed:** Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates). - **Compositing Transparent:** Cut-off grade and internal dilution rules are clearly stated for reported intervals. - **Refractory Ore:** Complex mineralogy requiring oxidation or other special processing before recovery. - **Apparent Width Only:** Interval given as downhole width with no true width or drill orientation — apparent width may overstate true thickness. - **Stale Data Re-release:** Historical results re-announced with no new assays or reinterpretation — low genuine novelty. - **No QA/QC Disclosure:** Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document. - **Metal Equivalent Opaque:** Metal equivalent grade reported without disclosing the price, recovery, or payability assumptions used. - **Cut-off Undisclosed:** Cut-off grade not disclosed — cannot assess comparability to prior estimates or peers. - **Deleterious Elements Present:** Penalty elements (arsenic, antimony, etc.) or refractory concerns noted in the release. - **Infill Drilling:** Confirmatory drilling to raise resource confidence, not new discovery. - **Nearology Play:** Value premise rests on proximity to a known deposit rather than own results. - **Measured Resource:** Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. - **Indicated Resource:** Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. - **Proven Reserve:** Measured Resource with demonstrated economic viability after applying modifying factors. - **Probable Reserve:** Indicated Resource with demonstrated economic viability after applying modifying factors. - **Category Upgrade:** Resource confidence improved — Inferred upgraded to Indicated, or Indicated to Measured. De-risking signal. - **Tonnage Growth:** Significant tonnage increase (≥15%) vs prior estimate with grade maintained or improved. - **Grade Improvement:** Average resource grade improved vs prior estimate — better deposit economics. - **Contained Metal Growth:** True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes. - **QP/CP Signed:** 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. - **Cut-off Disclosed:** Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. - **JORC Compliant:** Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard. - **NI 43-101 Compliant:** Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard. - **Inferred Resource:** Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. - **All Inferred:** 100% of resource is Inferred category — very early stage, no engineering confidence. - **Grade Decline:** Average grade dropped >5% vs prior estimate — deposit economics worsening. May indicate high-grading in early drilling. - **Tonnage Decline:** Resource tonnage decreased vs prior estimate — pit optimization removed marginal material or geological model revised down. - **Category Downgrade:** Resource confidence decreased — Measured downgraded to Indicated, or Indicated to Inferred. Unusual and concerning. - **Contained Metal Decline:** Contained metal decreased vs prior despite tonnage growth — grade dilution exceeds volume gain. - **Dilutive Growth:** Tonnage increased but contained metal flat or down — likely from lower cut-off grade, not geological expansion. - **Cut-off Lowered:** Cut-off grade significantly reduced vs prior estimate — tonnage growth may be artificial inflation. - **Cut-off Undisclosed:** Cut-off grade not disclosed — cannot assess comparability to prior estimates or peers. - **Historical Estimate Only:** Estimate pre-dates or does not comply with current JORC/NI 43-101 standards — requires verification drilling. - **Stale Estimate:** Effective date is >2 years old — data currency concern, may not reflect current geological understanding. - **No Contained Metal:** Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. - **No QP/CP Disclosure:** No Qualified Person or Competent Person named — lower credibility for the estimate. A QP/CP should be a member of a recognized professional association with relevant experience. - **Maiden Resource:** First formal MRE for the project — establishes baseline but typically exploration-stage with high Inferred component. - **Resource Update:** Revised estimate for an existing resource — compare to prior to assess progress. - **PEA-Supporting:** Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. - **PFS-Supporting:** Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component. - **DFS-Supporting:** Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. - **High Recovery:** Recovery at or above the exceptional band for the commodity and processing route. - **Pilot Scale Complete:** Pilot or demonstration plant testing completed under continuous operation. - **Free Milling:** Simple, clean ore amenable to standard processing without oxidation. - **Multi-Domain Tested:** Variability across ore domains (oxide, transition, fresh) has been addressed. - **Recovery Improving:** Recovery improved versus a like-for-like prior test program on the same domain and route. - **Low Recovery:** Recovery below the weak band for the commodity and processing route. - **Bench Scale Only:** Only preliminary bench tests completed — no locked-cycle or pilot work. - **Refractory Ore:** Complex mineralogy requiring oxidation or other special processing before recovery. - **Single Domain Only:** Testing limited to one composite or domain — representativeness not established. - **Recovery Stagnant:** No improvement across multiple test programs on comparable material. - **Theoretical Recovery Only:** Only theoretical or liberation-derived recovery reported, with no actual test result. - **Heap Leach Route:** Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. - **Mill Route:** Processing via mill or concentrator (CIL, CIP, tank leach, flotation). - **Gravity Route:** Gravity separation forms a material part of the flowsheet. - **POX/BIOX Route:** Pressure or bio-oxidation for refractory ore — high CAPEX and OPEX. - **Byproduct Commodity:** The tested commodity is a byproduct rather than the primary economic driver.