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
- 2026-08-20 21:46:27 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
US Copper has announced positive locked cycle metallurgical test results for the Superior sulphide zone at the Moonlight-Superior Copper Project. The tests achieved 91% copper recovery with a 24% Cu concentrate, confirming the robustness of the proposed flotation flowsheet.
Reasoning: The locked cycle test results show strong copper recovery (91%) and a high-grade concentrate (24% Cu) using a conventional flotation flowsheet, supporting the project's PEA and advancing it toward PFS.
Positive factors
- High copper recovery in locked cycle test
- Conventional and simple flowsheet
- Low pyrite and arsenic content
- Excellent stability in locked cycle testing
Negative factors
- Silica dilution in concentrate noted as an improvement opportunity
- Variability test results were open circuit and indicative only
Facts used in scoring: 4
Classification and evidence
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: The flowsheet uses flotation with grinding and regrinding.
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: The document notes low pyrite content and simple flotation response.
Evidence · text
“Owing to the low pyrite content of the sample, grinding and flotation were conducted at natural pH of ~8.5.”
Extracted facts
Stored fact records: 4. Some facts used in scoring do not have a stored record.
Metallurgical Results (4)
locked-cyclecopperRecovery: 91 %Head Grade: 0.32Head Grade Unit: %View all detailsHide details
Identity
- Commodity
- copper
- 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 (KM7834 LCT-23)
Recovery
- Recovery
- 91 %
- Recovery Basis
- actual_test
- Head Grade
- 0.32
- Head Grade Unit
- %
- Conc. Grade
- 24
- Conc. Grade Unit
- %
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 in a locked cycle test is a significant de-risking milestone.
Positive factors
- 91% recovery is strong for copper flotation
Evidence · text
“returned a copper concentrate grading 24% Cu... at a 91% copper recovery”
locked-cyclegoldRecovery: 74 %Head Grade: 0.02Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- USCU
Test Work
- Program Status
- detailed
- Test Type
- locked-cycle
- Sample
- resource average master composite (KM7834 LCT-23)
Recovery
- Recovery
- 74 %
- Recovery Basis
- actual_test
- Head Grade
- 0.02
- Head Grade Unit
- g/t
- 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: Recovery is decent for a byproduct, though head grades are very low.
Positive factors
- 74% recovery for low-grade precious metals
Negative factors
- Full metal balances not conducted due to low head grades
Evidence · text
“74% gold recovery”
locked-cyclesilverRecovery: 78 %Head Grade: 2.8Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- silver
- Ticker
- USCU
Test Work
- Program Status
- detailed
- Test Type
- locked-cycle
- Sample
- resource average master composite (KM7834 LCT-23)
Recovery
- Recovery
- 78 %
- Recovery Basis
- actual_test
- Head Grade
- 2.8
- Head Grade Unit
- g/t
- Conc. Grade
- 178
- Conc. Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-06-17T00:00:00.000Z
Reasoning: Solid recovery for a byproduct metal.
Positive factors
- 78% recovery for silver
Evidence · text
“78% silver recovery”
flotationcopperRecovery: 84 %Head Grade: 0.565Head Grade Unit: %View all detailsHide details
Identity
- Commodity
- copper
- Ticker
- USCU
Test Work
- Program Status
- preliminary
- Test Type
- flotation
- Sample
- 8 variability samples (VAR1 to VAR8) open circuit cleaner test
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: Results are positive but limited by the open circuit nature of the testing.
Positive factors
- Average recovery of 84% across variability samples
Negative factors
- Open circuit tests are only indicative
- Silica dilution noted in some samples
Evidence · text
“achieved average copper recovery of 84% at concentrate grades of 24% Cu”
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.