MineralProject dossier · Capstone Copper Corp. · CS.TO ↗
Mantoverde
Mantoverde is an operating copper-gold mine in Chile. Its reported mine output covers the whole operation; Capstone owns 70%. Expansion milestones below retain their source dates and conditional status.
This page summarizes issuer and government claims from the linked documents. It is source-checked synthesis, not independent field reporting.
Dossier reviewed Sep 10, 8:58 p.m. EDT. Company identity matches the reviewed listing directory.
Reported facts
| Fact | Reported value | As of | Source |
|---|---|---|---|
| Location and mine type | Open-pit mine in Chañaral province, Atacama, Chile; approximately 56 km southeast of Chañaral. | Capstone Copper Corp. · Publication date not stated | |
| Reported ownership | Capstone Copper 70%; Mitsubishi Materials Corporation 30%. | Capstone Copper Corp. · Publication date not stated | |
| Processing and products | Sulphide concentration produces copper concentrate with gold by-product credits. Leaching and solvent extraction–electrowinning produce copper cathodes. | Capstone Copper Corp. · Publication date not stated | |
| Q2 2026 contained copper | 23,485 tonnes: 18,190 tonnes in concentrate plus 5,295 tonnes of cathodes. Reported on a 100% mine basis, not Capstone-attributable output. | Capstone Copper Corp. · Jul 30, 2026 | |
| Q2 comparison | Q2 2025 total: 24,986 tonnes. The issuer attributes the Q2 2026 decrease to lower cathode production, partly offset by higher concentrate output. | Capstone Copper Corp. · Jul 30, 2026 | |
| Q2 sulphide throughput | 36,264 ore tonnes per day, averaged across Q2 2026. Throughput measures processed ore, not copper output. | Capstone Copper Corp. · Jul 30, 2026 | |
| MV Optimized construction | The issuer operations page describes the concentrator expansion as under construction. This review does not establish completed tie-in or ramp-up. | Capstone Copper Corp. · Publication date not stated |
Recorded milestones
- Development project reached commercial productioncompleted
Capstone reports commercial production after first copper concentrate in June 2024.
September 2024 · status recorded as of Jul 8, 2025 · Capstone Copper Corp. · Jul 8, 2025 - MV Optimized environmental permit reportedcompleted
Capstone reported receipt of the DIA environmental permit. This is an issuer statement, not a fresh government permit audit.
July 8, 2025 announcement · status recorded as of Jul 8, 2025 · Capstone Copper Corp. · Jul 8, 2025 - MV Optimized tie-in and ramp-uppending
The July report scheduled tie-ins in Q3 and ramp-up in Q4, targeting sustained 45,000 ore tonnes per day from early 2027. Completion is not established here.
Q3 / Q4 2026 targets · status recorded as of Jul 30, 2026 · Capstone Copper Corp. · Jul 30, 2026 - Pyrite augmentation sanctioningpending
The report records July board approval, with formal sanction still conditional on joint-venture partner approval; completion was targeted for early 2028.
Q3 2026 target after partner approval · status recorded as of Jul 30, 2026 · Capstone Copper Corp. · Jul 30, 2026
Limits
- Issuer-reported operating results may be adjusted after final settlements. Mine production is shown on a 100% basis; ownership is stated separately.
- The operating mine, MV Optimized expansion and proposed pyrite augmentation are distinct stages. Forward targets are not achieved capacity or output.
- This selected dossier does not independently establish current permits, reserves, resources, project economics or funding sufficiency. It is not field reporting.
Primary sources
- Capstone Copper Corp.: Mantoverde operationPublication date not stated · retrieved Sep 10, 8:58 p.m. EDT · Overview, Location, Operation and Growth sections
- Capstone Copper Corp.: Q2 2026 report to shareholdersPublished Jul 30, 2026 · retrieved Sep 10, 7:45 p.m. EDT · PDF page 14 (printed page 13), operating table and footnotes; PDF page 10 (printed page 9), expansion updates
- Capstone Copper Corp.: Mantoverde Optimized environmental permit announcementPublished Jul 8, 2025 · retrieved Sep 10, 8:58 p.m. EDT · Opening permit announcement and Mantoverde Operation Summary