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Chile
Centinela (Esperanza) Mine

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 Location:
25 km SE from Sierra Gorda, Chile

  Regional Office:
Av. Apoquindo 4001 P. 18
Las Condes
Santiago
Chile
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Gold
  • Molybdenum
Mining Method
  • Truck & Shovel / Loader
Processing
  • Sulfuric acid (reagent)
  • Flotation
  • Heap leach
  • Solvent Extraction & Electrowinning
Mine Life48 years (as of Jan 1, 2019)


Owners & OPERATOR

 
CompanyInterestOwnership
Marubeni Corp. 30 % Indirect
Antofagasta plc. 70 % Indirect
Minera Centinela S.A. (operator) 100 % Direct

Deposit Type

  • Porphyry


Summary:

The Mirador deposit is a multiphase porphyry Cu Au-Mo system, within which four intrusive pulses dated by the U-Pb zircon method at 41.3 + 0.4 to 38.4 + 0.7 Ma are currently recognized. These are: feldspar- and biotite-bearing granodioritic Mirador porphyry; dacite porphyry with biotite and quartz eyes; porphyritic granodiorite stock; and late dacite porphyry. The deposit occurs within the Domeyko fault system but is localized by a N65-80°W-trending fault, suggesting the possibility of a new structural system with potential to host porphyry copper deposits in the Centinela district. The porphyry system is emplaced into Jurassic calcareous shale and gypsum, giving rise to peripheral, locally mineralized skarn.

Four mineralization types are recognized: early porphyry Cu-Au with potassic alteration, EB, A and B veinlets, and hypogene chalcopyrite bornite-Au mineralization; Granodiorite stock with Cu-Mo mineralization, sericite-chlorite alteration, fine-grained disseminated sulfides and abundant molybdenite; Cu-Au-bearing garnet skarn with chalcopyrite-pyrite-magnetite; and hornfels and skarn displaying in situ oxidation, which is affected by gravitational collapse due to basal gypsum dissolution. Piedmont gravel and tectonic and solution-collapse breccias then channeled supergene copper-bearing solutions, leading to precipitation of chrysocolla, antofagastite and copper wad. The resultant high grade oxide copper ore is currently being exploited by Minera Centinela.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Fleet and mining equipment:

- Drilling:
- Atlas Copco Pit Viper PV351 production drill rigs
- Atlas Copco DMM3 production drill rigs
- Atlas Copco ROC L-8 down-the-hole crawler
- Atlas Copco ROC D560 surface drill rig
- Atlas Copco ROC D45 surface drill rig

- Loading:
- P&H 4100 XPC electric rope shovels
- Komatsu PC8000 diesel hydraulic shovels
- Komatsu PC5500 diesel hydraulic back hoe
- LeTorneau L2350HL front-end loader
- LeTorneau L1350HL front-end loader
- Caterpillar 994 Front-end loader

- Haulage:
- Caterpillar 797F / 797B haul trucks (360 tonnes)
- Komatsu 930SE haul trucks (330 tonnes)
- Caterpillar 793F / 793C haul trucks (230 tonnes)


Crushing and Grinding


Processing

  • Sulfuric acid (reagent)
  • Flotation
  • Heap leach
  • Solvent Extraction & Electrowinning

Source: Subscription required

Summary:

Mined sulphide ore is milled to reduce its size before passing to flotation cells where it is upgraded to a concentrate containing some 25-35% copper. This concentrate is then shipped to a smelter operated by a third party and converted to copper metal.

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.

Recoveries & Grades:

CommodityParameter20192018201720162015
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Head Grade, % 0.590.730.940.810.98
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 0.30.210.220.280.24
Molybdenum Recovery Rate, %  ......  Subscription required  ......  Subscription required
Molybdenum Head Grade, % 0.0080.008
Subscription required - Subscription is required.

Production:

CommodityProductUnits20192018201720162015
Copper Cathode kt  ......  Subscription required  ......  Subscription required645676
Copper Metal in concentrate kt  ......  Subscription required  ......  Subscription required164180145
Copper Total kt  ......  Subscription required  ......  Subscription required228236221
Gold Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Molybdenum Metal in concentrate kt  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Daily ore mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required114.2 kt109.6 kt
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryOreTypeTonnage CommodityGrade
Proven & Probable Heap leach 325.5 Mt Copper 0.41 %
Proven & Probable Mill / Sulphide 2,155 Mt Copper 0.42 %
Proven & Probable Total 2,155 Mt Copper 0.41 %
Proven & Probable Mill / Sulphide 2,155 Mt Molybdenum 0.012 %
Measured & Indicated Heap leach 492.1 Mt Copper 0.39 %
Measured & Indicated Mill / Sulphide 3,023 Mt Copper 0.41 %
Measured & Indicated Total 3,516 Mt Copper 0.41 %
Measured & Indicated Mill / Sulphide 3,516 Mt Molybdenum 0.013 %
Inferred Heap leach 27 Mt Copper 0.33 %
Inferred Mill / Sulphide 1,168 Mt Copper 0.31 %
Inferred Total 1,195 Mt Copper 0.31 %
Inferred Mill / Sulphide 1,195 Mt Molybdenum 0.011 %

Commodity Production Costs:

CommodityUnits20192018201720162015
Cash costs Copper USD  ......  Subscription required  ......  Subscription required 1.81 / lb 1.75 / lb 2.27 / lb
Cash costs Copper USD  ......  Subscription required†  ......  Subscription required† 1.36 / lb† 1.19 / lb† 1.85 / lb†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units201920182017201620152014
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 535.1   535.6  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,266   1,986  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -131   464.4  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -163.5   434.9  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -113.9   163.9  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 238.4   767.2  
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 7, 2016:
HME TypeModelSize
Backhoe ....................... Subscription required
Drill ....................... Subscription required
Drill ....................... Subscription required
Drill ....................... Subscription required
Drill ....................... Subscription required
Drill ....................... Subscription required
Loader (FEL) ....................... Subscription required
Loader (FEL) ....................... Subscription required
Loader (FEL) ....................... Subscription required
Shovel ....................... Subscription required
Shovel (rope) ....................... Subscription required
Truck (haul) ....................... Subscription required 360 t
Truck (haul) ....................... Subscription required 360 t
Truck (haul) ....................... Subscription required 330 t
Truck (haul) ....................... Subscription required 230 t
Truck (haul) ....................... Subscription required 230 t
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 26, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 26, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 26, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 26, 2020
Subscription required - Subscription is required.

Staff:

EmployeesContractorsYear
Subscription required Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Press Release 2017
Press Release 2017
Corporate Presentation 2016
Annual Report 2015
Other 2015
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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