US Copper Announces Positive Locked Cycle Test Results from Metallurgical Testwork at the Moonlight-Superior Copper Project
Original announcement by tmx on
- Company
- US Copper Corp.
- Ticker
- USCU
- Exchange
- TSX
- Region
- California
- Primary commodity
- Copper
- Secondary commodities
- Gold, Silver
- Document categories
- Metallurgy
- Extracted
- 2026-09-19 02:54:43 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
US Copper Corp. has announced positive locked cycle metallurgical test results for the Moonlight-Superior Copper Project, achieving 91% copper recovery with a 24% Cu concentrate. The tests, conducted at ALS Metallurgy, confirm a robust and conventional flotation flowsheet for the Superior sulphide zone.
Reasoning: The locked cycle test results demonstrate high copper recovery and concentrate grade using a conventional flotation flowsheet, providing technical de-risking for the upcoming PFS.
Positive factors
- High copper recovery (91%) in locked cycle test
- Strong concentrate grade (24% Cu)
- Conventional and simple flowsheet
- Low pyrite and arsenic content
- Successful variability testing confirming performance
Negative factors
- Silica dilution in concentrate (13%)
- Gold and silver recoveries are lower than copper (74% and 78%)
Facts used in scoring: 4
Classification and evidence
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: Copper recovery of 91% in locked cycle test is in the exceptional band for flotation.
Evidence · text
“returned a copper concentrate grading 24% Cu... at a 91% copper recovery”
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: The process uses flotation and regrinding, which is a mill-based route.
Evidence · text
“The optimized metallurgical flowsheet employed in these tests is conventional and simple, deploying a relatively coarse primary grind P 80 of ~200µm”
Free Millingpositive
Simple, clean ore amenable to standard processing without oxidation.
Why it applies: Low pyrite content and simple flotation response suggest clean ore.
Evidence · text
“Owing to the low pyrite content of the sample, grinding and flotation were conducted at natural pH of ~8.5.”
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: 4. Some facts used in scoring do not have a stored record.
Metallurgical Results (4)
locked-cycleMoonlight-Superior Copper Project · copperRecovery: 91 %Head Grade: 0.32Head Grade Unit: %View all detailsHide details
Identity
- Project
- Moonlight-Superior Copper Project
- Commodity
- copper
- Region
- california
- Reported Region
- California
- Ticker
- USCU
Test Work
- Program Status
- detailed
- Test Type
- locked-cycle
- Processing Route
- primary grind P 80 of ~200µm, regrind P 80 of 30-40µm, three stages of copper cleaning
- Sample
- resource average master composite from 69 intervals over 7 metallurgical drill holes at Superior
- Grind P80
- 200 µm
Recovery
- Recovery
- 91 %
- Recovery Basis
- actual_test
- Head Grade
- 0.32
- Head Grade Unit
- %
- Conc. Grade
- 24
- Conc. Grade Unit
- %
- Mass Pull
- 1.2 %
Lab
- Laboratory
- ALS Metallurgy
- Consultant
- Libertas Metallurgy Ltd.
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-17T00:00:00.000Z
Reasoning: High recovery and concentrate grade on a representative master composite.
Positive factors
- 91% recovery is excellent for copper flotation
Evidence · text
“returned a copper concentrate grading 24% Cu... at a 91% copper recovery”
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
locked-cycleMoonlight-Superior Copper Project · goldRecovery: 74 %View all detailsHide details
Identity
- Project
- Moonlight-Superior Copper Project
- Commodity
- gold
- Region
- california
- Reported Region
- California
- Ticker
- USCU
Test Work
- Program Status
- detailed
- Test Type
- locked-cycle
- Sample
- resource average master composite from 69 intervals over 7 metallurgical drill holes at Superior
Recovery
- Recovery
- 74 %
- Recovery Basis
- actual_test
- Conc. Grade
- 1.2
- Conc. Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-17T00:00:00.000Z
Reasoning: Gold recovery is reported as an estimate based on concentrate vs feed units.
Negative factors
- Recovery is lower than copper
Evidence · text
“Gold and silver recovery to copper concentrate were estimated to be 74% and 78% respectively”
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: 74% is below the weak band (80%)
locked-cycleMoonlight-Superior Copper Project · silverRecovery: 78 %View all detailsHide details
Identity
- Project
- Moonlight-Superior Copper Project
- Commodity
- silver
- Region
- california
- Reported Region
- California
- Ticker
- USCU
Test Work
- Program Status
- detailed
- Test Type
- locked-cycle
- Sample
- resource average master composite from 69 intervals over 7 metallurgical drill holes at Superior
Recovery
- Recovery
- 78 %
- Recovery Basis
- actual_test
- Conc. Grade
- 178
- Conc. Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-17T00:00:00.000Z
Reasoning: Silver recovery is reported as an estimate based on concentrate vs feed units.
Negative factors
- Recovery is lower than copper
Evidence · text
“Gold and silver recovery to copper concentrate were estimated to be 74% and 78% respectively”
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
flotationMoonlight-Superior Copper Project · copperRecovery: 84 %Head Grade: 0.565Head Grade Unit: %View all detailsHide details
Identity
- Project
- Moonlight-Superior Copper Project
- Commodity
- copper
- Region
- california
- Reported Region
- California
- Ticker
- USCU
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Processing Route
- flotation
- Sample
- 8 variability tests (VAR1 to VAR8)
Recovery
- Recovery
- 84 %
- Recovery Basis
- actual_test
- Head Grade
- 0.565
- Head Grade Unit
- %
- Conc. Grade
- 24
- Conc. Grade Unit
- %
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-17T00:00:00.000Z
Reasoning: Average results from open circuit variability testing.
Positive factors
- Confirms general metallurgical performance
Negative factors
- Results are indicative as they were not locked cycle
Evidence · text
“achieved average copper recovery of 84% at concentrate grades of 24% Cu”
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the flotation signal
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.