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Chile
Los Bronces Mine

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 Location:
47 km NE from Santiago, Chile

  Regional Office:
Isidora Goyenechea, Torre Titanium, piso 47, Las Condes
Santiago
Chile
2800
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WebsiteWeb
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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
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life36 years (as of Jan 1, 2021)
Los Bronces is one of the world’s largest copper mines.

23 April, 2022 - Anglo American plc is currently engaged in an environmental assessment process for its Los Bronces Integrated Project (LBIP) in Chile, a process which began in 2019. LBIP is a mine life extension project which expands the current open pit within Los Bronces’ operating site and replaces future lower grade ore by accessing higher grade ore from a new underground section of the mine. The project uses the mine’s existing processing facilities, optimises water efficiency, and requires no additional water or tailings storage facilities.


Owners

Source: p. 22
CompanyInterestOwnership
Mitsubishi Materials Corp. 20.4 % Indirect
Mitsui & Co., Ltd. 29.5 % Indirect
Anglo American plc. 50.1 % Indirect
Anglo American Sur S.A. (operator) 100 % Direct
Los Bronces are operated by Anglo American Sur S.A. Its shareholders are Anglo American through Inversiones Anglo American Sur S.A. and Anglo American Clarent (UK) Ltd; Mitsubishi, through MC Resource Development Ltd. and Codelco and Mitsui, through Inversiones Mineras Becrux SpA.

50.1% Anglo; 29.5% Codelco and Mitsui JV; 20.4% Mitsubishi.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Porphyry
  • Breccia pipe / Stockwork
  • Hydrothermal


Summary:

The Los Bronces deposit is part of the Miocene Pliocene Río Blanco – Los Bronces porphyry copper system with mineralisation extends 9km from North to South and 3km from East to West. The deposit is open at depth and laterally.

The main ore body is a complex assemblage of hypogene copper-molybdenum sulphide breccia hosted mineralisation that was subsequently overprinted by surface-related supergene processes. The hypogene sulphide mineralisation shows a close relationship with the intrusion of porphyry dykes and sills, development of large-scale alteration zones, vein development, and breccia emplacement. The ore body is related to at least seven hydrothermal breccia pipes forming a large elliptic body of 2km in length, 0.7km wide and 1.0km in depth. The shape of the breccia system is ‘funnel-like’, characterised by sharp contacts with the host rocks in the upper part of the column and transitional at depths.

The host rocks are the volcanic sequence of the Farellones Formation and the plutonic rocks of the San Francisco Batholith which intrude the Farellones Formation. Copper mineralisation is associated with the emplacement of a complex system of porphyry intrusions (quartz monzonites and quartz monzodiorites) and hydrothermal breccias. Early copper and molybdenum mineralisation is hosted in the porphyry stock, in high-grade breccia bodies and is disseminated throughout the bordering country rocks.

Breccia-hosted mineralisation is typically a ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Los Bronces is an open-pit copper and moly mine.


Crushing and Grinding
Source: Subscription required


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits2021202020192018201720162015
Copper Cathode t  ......  Subscription required  ......  Subscription required  ......  Subscription required39,00038,30036,00035,000
Copper Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required330,500270,000271,200366,700
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required65,915,300 t59,207,400 t49,339,600 t51,109,700 t
Tonnes processed  ......  Subscription required  ......  Subscription required42,008,400 t50,583,000 t46,040,000 t47,697,000 t
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Reserves at December 31, 2021:
Ore Reserves cut-off: Los Bronces (Flotation) 0.2%TCu, Los Bronces (Dump Leach) – 0.15%TCu.
Mineral Resources cut-off: Los Bronces (Flotation) – 0.2%TCu, Los Bronces (Dump Leach) – 0.15%TCu.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven & Probable Leach Pad 481 Mt Copper 0.28 % 1,325 kt
Proven & Probable Sulphide 1,275 Mt Copper 0.55 % 6,975 kt
Proven & Probable Sulphide 1,275 Mt Molybdenum 0.014 % 178 kt
Measured & Indicated In-Situ (UG) 824.1 Mt Copper 1.39 % 11,435 kt
Measured & Indicated Sulphide 2,495 Mt Copper 0.45 % 11,130 kt
Measured & Indicated In-Situ (UG) 824.1 Mt Molybdenum 0.024 % 197 kt
Measured & Indicated Sulphide 2,495 Mt Molybdenum 0.009 % 215 kt
Inferred Leach Pad 3.7 Mt Copper 0.24 % 9 kt
Inferred In-Situ (UG) 3,322 Mt Copper 1.06 % 35,216 kt
Inferred Sulphide 132.7 Mt Copper 0.49 % 650 kt
Inferred In-Situ (UG) 3,322 Mt Molybdenum 0.024 % 197 kt
Inferred Sulphide 132.7 Mt Molybdenum 0.013 % 17 kt

Commodity Production Costs:

CommodityUnits202120202019201820172016
C1 cash costs Copper USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1.34 / lb†   1.69 / lb†   1.56 / lb†  
† Net of By-Product.
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Financials:

Units202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 217   245   241  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 2,175   1,839   1,386  
EBIT M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 736   401   -49  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 969   737   326  
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Pipelines
Source: Subscription required


Heavy Mobile Equipment as of October 17, 2019:
HME TypeModelQuantity
Drill ....................... Subscription required
Loader (FEL) ....................... Subscription required
Shovel ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
Other 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Corporate Presentation 2018
Other 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Annual Report 2015
Year-end Mineral Reserves 2015
Year-end Mineral Reserves 2015
Corporate Presentation 2012
Corporate Presentation 2009
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