Our operations


Mantoverde is an open-pit mine located in the Atacama region of Chile. It is currently comprised of four pits situated along the Mantoverde fault, each of which contains both sulphide and oxide ores. Mantoverde currently mines and processes only the oxide ore. Mining is performed using truck-and-shovel technology.




Open pit


70% owned by
Capstone Copper
30% Mitsubishi
Materials Corporation


Region of


tpd sulphide

mill (MVDP) under



MVDP on track

for completion

in Q4 2023*


tonnes per year
copper cathode


FS scheduled
in H1 2024

*88% overall completion at June 30, 2023

Map depicting the location of the Mantoverde operation


Mantoverde is an open-pit mine mine located in the province of Chañaral, Atacama Region, 56 kilometers southeast of the city of Chañaral and 100 kilometers north of the city of Copiapó, at an altitude of approximately 900 masl.


Mantoverde currently operates heap and dump run of mine (“ROM”) leaching and conventional SX-EW to treat oxide ore to produce 45,000 to 50,000 tonnes per year of high-purity LME Grade “A” copper cathodes. The mine consists of four pits situated along the Mantoverde fault, each of which contains both sulphide and oxide ores.

The mine owns a state-of-the-art desalination plant, located approximately 40 kilometers west of the mine that supplies all the water required by the operation with 120 liters per second. The plant is being expanded to supply 380 liters per second to sustain the mine’s expanded operations after completion of the Mantoverde Development Project (“MVDP”) in late 2023.

Mantoverde Development Project – MVDP

The MVDP is expected to increase production from approximately 49,000 tonnes of copper (cathodes only – April 1 to December 31, 2022) to a run-rate of approximately 120,000 tonnes of copper in 2024. A new concentrator plant will treat sulphide material to produce copper concentrate while oxide ores will continue to be treated in the existing SX-EW plant. Mining assumes conventional open pit operations using truck-and-shovel technology.

The MVDP consists of processing sulphide ores in a concentrator with a capacity of 12.3 Mt per year, which is currently under construction and on schedule for completion in late 2023. MVDP is progressing under a lump-sum turn-key engineering, procurement and construction (“EPC”) contract with Ausenco Limited. MVDP’s total capital costs are estimated at $825 million. The project is on budget and on schedule for completion in Q4 2023.

Overall project progress (at June 30, 2023): 88%

Please see here for a virtual site tour of the Mantoverde Development Project: https://vrify.com/decks/12698-mantoverde-development-project

Growth – MVDP Optimized and Mantoverde Phase II

Capstone is currently analyzing the next expansion of the sulphide concentrator. The Company has identified that the desalination plant capacity and major components of the comminution and flotation circuits of the Mantoverde Development Project are capable of sustaining average annual throughput of between 40,000 and 45,000 tonnes per day with no major capital equipment upgrades. Capstone continues to work with Ausenco’s engineering team to develop the Optimized Mantoverde Development Project (“MVDP Optimized”), including evaluating the costs and timelines of debottlenecking the minor components of the plant to meet the potential throughput target. The Feasibility Study is on track for completion late in H2 2023.

Mantoverde Phase II will evaluate the addition of an entire second processing line, possibly a duplication of the first line, to process some of the additional 77% of resources not utilized by MVDP Optimized. Current activities are focused on understanding the optimum concentrator capacity and mine plan, along with the implications to the timing and permitting for the project.

Geology and Exploration

The Mantoverde deposit is a typical iron oxide–copper–gold (IOCG) deposit located within the Atacama Fault System. It is located in an ancient mining district with numerous Fe, Fe-Cu-Au, Au and Mn deposits in the southern sector of the Atacama Fault System within the Cretaceous iron belt. Copper mineralization is oxidized down to approximately 200 m depth and two types of oxidized copper ores are recognized. The breccias in the sloping fault block contain abundant haematite with brochantite, minor antlerite, chrysocolla, malachite and atacamite, which occur in veinlets, patches and disseminated in the specularite matrix.

Mantoverde District and Near-Mine Exploration – Oxides and Sulphides

Mantoverde has a history of Mineral Reserves and Resources growth through successful exploration. The current Mineral Resource is open at depth in multiple locations along the main Mantoverde, Santa Clara and Montecristo faults. Future drilling programs will focus on deeper high-grade zones and on sulphide areas in the northern portion of the deposit in the underexplored Santa Clara Corridor, which has potential to expand the current Mineral Resource and support conversion into Mineral Reserves.

Mantoverde also has significant potential to develop a larger mining district. Several oxide and sulphide near-mine resource expansion opportunities exist within the mine’s 23 km land package along the Atacama Fault System. District targets identified to date include the Las Animas, Paloma, Las Juntas, San Manuel and Santa Clara targets, north of the current pit design.

2023 Guidance**

Cathode Production

Cu Production34.3 – 35.8 thousand tonnes
C1 Cash Costs*$3.72 – $3.83/lb Cu
Sustaining Capital$25 million
Expansionary Capital$225 million
Capitalized Stripping$120 million

*Key Assumptions: CLP/USD: 800:1, Silver: $20/oz. Production shown on a 100% basis. All figures in USD.

**Cu production and C1 cash costs based on H1 2023 actuals plus H2 2023 guidance.