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Chile
Centinela (Esperanza, El Tesoro) Mine

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 Location:
64 km S from Calama, Chile

  Regional Office:
Av. Apoquindo 4001 P. 18
Las Condes
Santiago
Chile
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  • Mining
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Gold
  • Molybdenum
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2066
Centinela consists of Centinela Concentrates (Esperanza + Esperanza Sur and Encuentro Sulphide mostly sulphide porphyry deposits) and Centinela Cathodes (Tesoro Central and Tesoro Sur oxide deposits, including the oxide portion of the Mirador, Encuentro and Llano deposits).

The second concentrator and its potential further expansion to 150,000 tonnes of ore per day will source ore initially from the recently opened Esperanza Sur pit and later from the Encuentro pit. The sulphide ore in the Encuentro pit lies under the Encuentro Oxides reserves, which are expected to be depleted by 2026.

To build a second concentrator at Centinela is expected to be put to the Board for approval by the end of 2023.


Owners

Source: p. 213,256
CompanyInterestOwnership
Marubeni Corp. 30 % Indirect
Antofagasta plc. 70 % Indirect
Minera Centinela S.A. (operator) 100 % Direct
Minera Centinela S.A., is a 70%-owned subsidiary of Antofagasta, and holds the Centinela operations. Marubeni Corporation, the Antofagasta’s 30% minority partner in Centinela and Antucoya.

Contractors

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Deposit Type

  • Porphyry


Summary:

The Centinela district is a 40-km-long segment of the late Eocene to early Oligocene porphyry copper belt of northern Chile. The main mineralization styles in the district include porphyry copper and associated skarns with gold and molybdenum credits, oxide copper in the form of either exotic deposits or in situ oxidation zones, and supergene copper sulfide enrichment blankets. Structurally controlled, district-wide porphyry copper mineralization formed between 44 and 41 Ma, contemporaneously with transpressional tectonism along the regional-scale Centinela-Limón Verde fault zone, a splay of the major Domeyko fault system. The Domeyko fault system accommodated tectonic uplift of the Cordillera de Domeyko during early stages of the middle Eocene Incaic orogeny. Several productive porphyry copper systems in the district were emplaced syntectonically along reverse- and oblique-slip faults that controlled the shape and attitude of both the dominantly dikelike intrusions and associated alteration mineralization. All the porphyry copper deposits in the district evolved from early potassic alteration with copper mineralization present as chalcopyrite and bornite, through sericite-chlorite alteration with chalcopyrite and pyrite, to late, overprinting pyritic sericitic alteration. Some systems developed advanced argillic lithocaps in their upper parts. Much of the copper was introduced with the potassic alteration, and all the gold-rich deposits display abundant hydrothermal magne ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Centinela mines sulphide and oxide deposits and is one of Chile’s most important mining areas.

Centinela consists of Centinela Concentrates (Esperanza + Esperanza Sur and Encuentro Sulphide mostly sulphide porphyry deposits) and Centinela Cathodes (Tesoro Central and Tesoro Sur oxide deposits, including the oxide portion of the Mirador, Encuentro and Llano deposits).

Minning operations is carried out via conventional truck and shovel drill and blast method. Of all Centinela consumes the most diesel, operating some 120 mine haulage trucks and mining from six open pits.

Esperanza Sur pit
The Esperanza Sur pit is 4 km south of the Esperanza pit, close to Centinela’s concentrator plant. The deposit contains 1.4 billion tonnes of reserves with a grade of 0.4% copper, 0.13g/t of gold and 0.012% of molybdenum.

Pre-stripping by a contractor was completed in July and Centinela has taken over the operation of the pit using a fleet of 11 autonomous trucks, the first to be used by the Group. Ore from the pit is now being processed at the Centinela concentrator.

The opening of the Esperanza Sur pit improves Centinela’s flexibility in supplying its concentrator and, over the initial years, the higher-grade material from the pit will increase production by some 10–15,000 tonnes of copper per year, compared with production levels if the material was supplied solely from the Esperanza pit. This greater flexibility will allow Cent ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

^ Guidance / Forecast.

Production:

CommodityProductUnits2023202220212020201920182017
Copper Total kt  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required248228
Gold Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Molybdenum Metal in concentrate kt  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Cathode kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required9264
Copper Metal in concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required156164
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Daily processing rate  ......  Subscription required  ......  Subscription required97 kt of ore (in concentrator)92.9 kt of ore (in concentrator)96.8 kt of ore (in concentrator)89.7 kt of ore (in concentrator)
Daily processing rate  ......  Subscription required  ......  Subscription required56.9 kt of ore (in heap leach)48.4 kt of ore (in heap leach)45.5 kt of ore (in heap leach)28.1 kt of ore (in heap leach)
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Reserves at December 31, 2022:
The cut-off grade applied to the determination of ore reserves for Centinela Concentrates is 0.15% equivalent copper, with 0.15% copper used as a cut-off grade for mineral resources.

The cut-off grades used at Centinela Cathodes are 0.20% copper for ore reserves and 0.15% copper for mineral resources.

CategoryOreTypeTonnage CommodityGrade
Proven & Probable Sulphide 1,713 Mt Copper 0.4 %
Proven & Probable Oxide 274.5 Mt Copper 0.37 %
Proven & Probable Total 1,987 Mt Copper 0.4 %
Proven & Probable Sulphide 1,713 Mt Gold 0.13 g/t
Proven & Probable Sulphide 1,713 Mt Molybdenum 0.012 %
Measured & Indicated Sulphide 2,848 Mt Copper 0.4 %
Measured & Indicated Oxide 398 Mt Copper 0.36 %
Measured & Indicated Total 3,246 Mt Copper 0.4 %
Measured & Indicated Sulphide 2,848 Mt Gold 0.14 g/t
Measured & Indicated Sulphide 2,848 Mt Molybdenum 0.013 %
Inferred Sulphide 1,789 Mt Copper 0.29 %
Inferred Oxide 15 Mt Copper 0.33 %
Inferred Total 1,804 Mt Copper 0.29 %
Inferred Sulphide 1,789 Mt Gold 0.08 g/t
Inferred Sulphide 1,789 Mt Molybdenum 0.011 %
Total Resource Sulphide 4,637 Mt Copper 0.36 %
Total Resource Oxide 413 Mt Copper 0.36 %
Total Resource Total 5,050 Mt Copper 0.36 %
Total Resource Sulphide 4,637 Mt Gold 0.12 g/t
Total Resource Sulphide 4,637 Mt Molybdenum 0.012 %

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Cash costs Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.89 / lb   1.81 / lb  
Credits (by-product) Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -0.38 / lb   -0.45 / lb  
Cash costs Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.51 / lb†   1.36 / lb†  
^ Guidance / Forecast.
† Net of By-Product.
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Financials:

Units2022202120202019201820172016
Sustaining costs M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 535.2   619.2   617.4  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,609   1,646   1,338  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 229.6   579.1   246  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 191.4   554.5   213.9  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 188.2   357.7   140.6  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 645   859.4   562.5  
Operating Cash Flow M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 207,500   68.1  
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Pipelines and Water Supply
Source: Subscription required

- subscription is required.


Heavy Mobile Equipment:
HME TypeModelSizeQuantityLeased or
Contractor
Ref. Date
Backhoe ....................... Subscription required Dec 7, 2016
Drill ....................... Subscription required Dec 7, 2016
Drill ....................... Subscription required Dec 7, 2016
Drill ....................... Subscription required Dec 7, 2016
Drill ....................... Subscription required Dec 7, 2016
Drill ....................... Subscription required Dec 7, 2016
Drill ....................... Subscription required ....................... Subscription required Apr 28, 2022
Loader (FEL) ....................... Subscription required Dec 7, 2016
Loader (FEL) ....................... Subscription required Dec 7, 2016
Loader (FEL) ....................... Subscription required Dec 7, 2016
Shovel ....................... Subscription required Dec 7, 2016
Shovel (rope) ....................... Subscription required May 11, 2023
Truck (haul) ....................... Subscription required ....................... Subscription required May 11, 2023
Truck (haul) ....................... Subscription required 360 t Dec 7, 2016
Truck (haul) ....................... Subscription required 360 t Dec 7, 2016
Truck (haul) ....................... Subscription required 330 t Dec 7, 2016
Truck (haul) ....................... Subscription required 230 t Dec 7, 2016
Truck (haul) ....................... Subscription required 230 t Dec 7, 2016
Truck (haul) ....................... Subscription required 240 t ....................... Subscription required Leased Feb 23, 2022
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 25, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 25, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 25, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 25, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 25, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsYear
Subscription required 2022
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Quarterly Report 2022
Sustainability Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Press Release 2018
Annual Report 2017
Press Release 2017
Press Release 2017
Corporate Presentation 2016
Annual Report 2015
Other 2015
Other 2010
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