American Tungsten & Antimony produces Grade A antimony ingot
Original announcement by stockhead on
- Company
- American Tungsten & Antimony
- Ticker
- AT4
- Exchange
- Unavailable
- Region
- Nevada
- Primary commodity
- Antimony
- Secondary commodities
- None reported
- Document categories
- Metallurgy
- Extracted
- 2026-10-13 21:17:24 UTC
Analysis by Minestarters Atlas
Atlas analysis published:
Minestarters Atlas analysis
Summary
American Tungsten & Antimony (AT4) has produced antimony ingot with 99.8% purity at its Del Sol refinery in Nevada, meeting ASTM B237 Grade A specifications. Independent testing confirmed the high-purity results, advancing the company's US-based mine-to-metal critical mineral strategy.
Reasoning: The production of high-purity Grade A antimony ingot validates the company's processing capabilities and critical mineral supply chain potential.
Positive factors
- Achieved ASTM B237 Grade A purity (99.8%)
- Exceeds Regulus II commercial grade threshold
- Independent testing by NSL Analytical Services
- Demonstrates successful mine-to-metal supply chain
Facts used in scoring: 2
Classification and evidence
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: The purity achieved (99.8%) is exceptional for the commodity and meets the highest industry standard.
Evidence · text
“AT4 produces ingot grading 99.8% antimony, meeting ASTM B237 Grade A”
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: The process involves electrowinning and fire refining at a refinery.
Evidence · text
“optimising electrowinning conditions and fire refining”
Multi-Domain Testedpositive
Variability across ore domains (oxide, transition, fresh) has been addressed.
Why it applies: 2 distinct composites were tested
Extracted facts
Stored fact records: 2. Some facts used in scoring do not have a stored record.
Metallurgical Results (2)
electrowinning and fire refiningDel Sol · antimonyHead Grade: 99.8Head Grade Unit: %View all detailsHide details
Identity
- Project
- Del Sol
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- AT4
Test Work
- Program Status
- detailed
- Test Type
- electrowinning and fire refining
- Processing Route
- electrowinning and fire refining
- Sample
- ASTM B237 Grade A ingot produced at Del Sol refinery
Recovery
- Head Grade
- 99.8
- Head Grade Unit
- %
- Conc. Grade
- 99.8
- Conc. Grade Unit
- %
Lab
- Laboratory
- NSL Analytical Services
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-10-13T00:00:00.000Z
Reasoning: 99.8% purity meets the highest commercial standard for antimony.
Positive factors
- Meets highest purity standard (Grade A)
- Exceeds Regulus II threshold
Evidence · text
“AT4 produces ingot grading 99.8% antimony, meeting ASTM B237 Grade A”
electrowinning and fire refiningDel Sol · antimonyHead Grade: 99.5Head Grade Unit: %View all detailsHide details
Identity
- Project
- Del Sol
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- AT4
Test Work
- Program Status
- detailed
- Test Type
- electrowinning and fire refining
- Processing Route
- electrowinning and fire refining
- Sample
- Four other ingots tested
Recovery
- Head Grade
- 99.5
- Head Grade Unit
- %
- Conc. Grade
- 99.5
- Conc. Grade Unit
- %
Lab
- Laboratory
- NSL Analytical Services
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-10-13T00:00:00.000Z
Reasoning: Secondary ingots achieved high purity (99.5-99.6%) but did not reach Grade A.
Positive factors
- Grades remain within high-purity commercial range
Evidence · text
“Four other ingots returned grades of 99.5% to 99.6% antimony”
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.