Mining Intelligence and News
Chile

Antucoya Mine

Click for more information

Categories

Summary

Mine TypeOpen Pit
StatusActive
Commodities
  • Copper
Mining Method
  • Truck & Shovel / Loader
Production Start2016
Mine Life2044
SnapshotAntucoya mines and leaches oxide ore to produce copper cathodes using the solvent extraction and electrowinning (SX-EW) process.

Since 2022, all Antofagasta's operations have been powered by electricity sourced from renewable energy.

In Q3 2024, Antucoya launched the Mineral Tracker 2.0 project to optimise copper leaching by integrating mining and processing systems through a real-time software platform that maps ore types and tracks their processing. This initiative aims to reduce sulphuric acid consumption, enhance irrigation efficiency, and improve copper recovery by 0.5 to 1.0 percentage points through better water management and reduced reliance on tertiary crushing.

Owners

SourceSource
CompanyInterestOwnership
Marubeni Corp. 30 % Indirect
Antofagasta plc. 70 % Indirect
Antofagasta plc owns the Antucoya mine through its 70%-owned subsidiary, Minera Antucoya S.A., with the remaining 30% held by its minority partner, Marubeni Corporation.

Contractors

ContractorContractDescriptionRef. DateExpirySource
Engie Energia Chile S.A. Power supply May, 2019 - Minera Antucoya has signed a long-term agreement with ENGIE Energia Chile SA. The new agreement, which will begin in January 2022 has a term of eleven years. ENGIE Energía Chile will supply around 300GWh of power generated by renewable energy sources to Minera Antucoya each year. January, 2022 - completed the transition of Antucoya to electricity generated exclusively from renewable sourced contract. May 31, 2019 11
Schwager S.A. Plant maintenance The contract with Minera Antucoya consists of Spot support services to cover major maintenance needs in the areas of Primary Crushing, Secondary Crushing, Tertiary Crushing, Agglomerate, Stacking, Gravels and Wet Area, which provides support to the needs of Minera Antucoya, in order to comply with the Maintenance Plan for the year 2022 and 2023. Dec 31, 2022
Sistema Eléctrico Nacional Power supply All operations of the Antofagasta are on Chile’s main grid, the National Electrical System (Sistema Eléctrico Nacional, SEN). Dec 31, 2024

Deposit type

  • Porphyry

Summary:

The Antucoya porphyry copper deposit is situated 120 km northeast of Antofagasta in the Early Cretaceous metallogenic belt of the Coastal Cordillera.

The mineralized system is related to granodioritic porphyry (Antucoya porphyry) and dacite porphyry (Buey Muerto porphyry). Late dacitic dikes intrude the former ore-related intrusions and Jurassic andesitic host rocks in a tectonic environment dominated by splays of the Atacama Fault System.

The principal mineralization constitutes a column 350 m thick, composed of atacamite, brochantite, Fe-Cu sulfates, Cubearing limonite, chrysocolla and black oxides, with rare chalcocite and covellite in a thin supergene enrichment blanket.

In the underlying hypogene zone, the mineralization is dominated by chalcopyrite>pyrite>bornite hosted by A- and B veins in potassic alteration, and in C-veins on the periphery of the porphyry intrusions. The pyrite/chalcopyrite ratio is greater in D-veins within a shallow phyllic zone. The Mo distribution is erratic and poorly characterized.

Reserves at December 31, 2024

The ore reserve cut-off grade is 0.15% copper, coinciding with the cut-off grade used for mineral resources.

Mineral Resources are reported inclusive of Mineral Reserves.
CategoryTonnage CommodityGrade
Proven 397.4 Mt Copper 0.32 %
Probable 294 Mt Copper 0.28 %
Proven & Probable 691.4 Mt Copper 0.3 %
Measured 412.6 Mt Copper 0.32 %
Indicated 354.4 Mt Copper 0.28 %
Measured & Indicated 767 Mt Copper 0.3 %
Inferred 280.9 Mt Copper 0.25 %
Total Resource 1,048 Mt Copper 0.29 %

Mining Methods

  • Truck & Shovel / Loader

Summary:

Antucoya is a low-grade, low strip-ratio, oxide deposit.

Conventional open-pit mining method with preliminary drilling and blasting operations is utilized for extraction oxide ore.

There are electric shovels and front-end loaders used for extraction-and-loading.

Heavy Mobile Equipment

Ref. Date: December 31, 2016

SourceSource
HME TypeModelQuantity
Drill Epiroc D65 1
Drill (blasthole) Caterpillar MD6240 2
Grader 1
Loader (FEL) LeTourneau L2350 1
Shovel (rope) - EV P&H 4100 XPC 2
Truck (haul) - EV Komatsu 930E 10
EV - Electric

Comminution

Crushers and Mills

TypeModelSizePowerQuantity
Jaw crusher 1
Cone crusher 2

Summary:

There are three stages of crushing at the Antucoya processing plant, primary jaw crushing, secondary and tertiary cone crushing.

Processing

  • Sulfuric acid (reagent)
  • Crush-and-stack plant
  • Heap leach
  • Solvent Extraction & Electrowinning

Summary:

Mined oxide ore is crushed, piled into heaps and then leached with sulphuric acid, producing a copper sulphate solution. This solution is then put through a solvent extraction and electrowinning (“SX-EW”) plant to produce copper cathodes, which are sold to fabricators around the world.

Solvent Extraction And Electrowinning
A process for extracting metal from an ore and producing pure metal. First the metal is leached into solution, the resulting solution is then purified in the solvent-extraction process before being treated in an electrochemical process (electrowinning) to recover cathode copper.

Recoveries & Grades:

CommodityParameter202420232022202120202019201820172016
Copper Head Grade, % 0.320.330.340.340.380.390.370.370.39
Copper Recovery Rate, % 69.467.96969.173.774.671.673.770.6
^ Guidance / Forecast.

Pipelines and Water Supply

TypeMaterialDiameterLengthDescription
Water pipeline ~12 km Sea water pipeline

Summary:

Antucoya has processes in place to manage and conserve freshwater.

Antucoya uses seawater in both mining and electrowinning plant. It also has reverse osmosis plant to produce drinking water for the camp. All the water used in camps and offices is collected for treatment in the wastewater treatment plant and is used to moisten our internal roads and the open pit loading area.

Antucoya operation has used raw sea water for a number of years, with the plant configured to handle saline water in processing. Local water wells were closed in 2022, and therefore the operation run on 100% sea water.

There is a shared pipeline between Antucoya and Centinela.

Commodity Production

CommodityUnits2025202420232022202120202019201820172016
Copper t 80,000-85,000 ^80,400 77,800 79,200 78,600 79,300 71,900 72,200 80,500 66,200 
All production numbers are expressed as cathode. ^ Guidance / Forecast.

Operational metrics

Metrics202420232022202120202019201820172016
Daily processing rate 92.7 kt88.6 kt89.4 kt85.5 kt76 kt66.5 kt74.7 kt79.7 kt67.6 kt
Waste 32,172,117 t33,576,000 t25 Mt27 Mt23 Mt23 Mt
Daily processing capacity 100,000 t100,000 t100,000 t100,000 t100,000 t

Production Costs

CommodityUnits202520242023202220212020201920182017
Cash costs Copper USD 2.7 / lb ^   2.53 / lb   2.63 / lb   2.5 / lb   2.04 / lb   1.82 / lb   2.17 / lb   1.99 / lb   1.68 / lb  
^ Guidance / Forecast.

Mine Financials

Units20242023202220212020201920182017
Sustaining costs M USD 80.3  88  58  
Capital expenditures M USD 123.4  122  67  62.7  44.6   50   65.7   78.2  
Revenue M USD 732.6  672.3  703.5  697.8  480.3   432.2   457.6   508.6  
Operating Income M USD 529.5  105.7  155.6  238.3  71.2   -5.9   62.9   131.2  
Pre-tax Income M USD 518.1  81.4  131.5  228  42.5   -47.7   11.4   85.1  
After-tax Income M USD 373.2  66.8  96.6  311.5  42.2   -47.9   27  
EBITDA M USD 275.8  215.1  261.2  337.1  165.8   86.3   141.6   207.3  
Operating Cash Flow M USD 286.4  209.7  162.1  295.3  147.3   73.8   80.8   240.7  

Personnel

Mine Management

Job TitleNameProfileRef. Date
Logistics Manager Cristian A. LinkedIn Jun 2, 2025
Maintenance Manager Alejandro Rojas Basoalto LinkedIn Jun 2, 2025
Mine General Manager Ivo Fadic LinkedIn Jun 2, 2025
Mining Manager Alex Calderon LinkedIn Jun 2, 2025
Operations Manager Patricio Mora LinkedIn Jun 2, 2025
Planning Superintendent Emapía Riveras Vergara LinkedIn Jun 2, 2025

Workforce

EmployeesContractorsYear
930 1,658 2024
949 1,747 2023
894 1,309 2022
817 2021
798 2020
787 2019
786 2018
737 2017
726 2016
698 2015

Aerial view: