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Chile
Lomas Bayas Mine

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 Location:
92 km E from Antofagasta, Chile

  Address:
Camino Minsal km 36 s/n, Sierra Gorda
Sierra Gorda
Chile
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  • Overview
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2029


Owners

Source: p. 11
CompanyInterestOwnership
Glencore plc. 100 % Indirect
Compania Minera Lomas Bayas S.A. (operator) 100 % Direct

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Porphyry


Summary:

Lomas Bayas is a low grade Cu-Mo deposit resulting from the intrusion of several porphyry and breccia systems that were later exposed to leaching and subsequent supergene enrichment and in situ oxidation. Green copper oxides, copper sulphates in various forms and less partially mixed ores are the main source of ore for the existing SX/EW operation. The copper oxidessulphate mineralisation is the basis of the Lomas Bayas Ore Reserves (Lomas Bayas I).

The deposit is located in a structural framework formed by three sets of faults along an ENE bend in the Tertiary strike-slip San Cristóbal Fault system. The deposit area is mainly underlain by granodiorite that has been intruded by a cluster of small granodiorite and/or granite to dacite porphyry bodies of the Lomas Porphyry. Later events, focused by the structural framework, include the emplacement of breccia pipes and zones as well as hydrothermal alteration and copper mineralisation.

The deposit area is characterised by a structural regime, the main structural elements of which are NNE, NW, north-south and WNW-trending high-angle faults and fractures, as well as west to SW-dipping, low-angle faults and fractures that occur to the north of the ENE-trending South Fault Zone.

Both primary and supergene mineralisation occurs at Lomas Bayas. The upper parts of the orebody are generally oxidised, with a few zones of mixed oxide-sulphide, and it is principally exploited as a heap-leach operation. C ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Lomas Bayas open cut operations are located in the centre of the Atacama Desert copper belt approximately 115 km to the northeast of the town of Antofagasta in Chile.


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits2021202020192018201720162015
Copper kt  ......  Subscription required  ......  Subscription required  ......  Subscription required73788071
All production numbers are expressed as cathode.
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Reserves at December 31, 2021:
Lomas Bayas (I)-Lomas Bayas (III): cut-off grade 0.12% CuT.
Lomas Bayas (II): cut-off grade 0.07% CuT.

CategoryOreTypeTonnage CommodityGrade
Proven & Probable Oxide 331 Mt Copper 0.3 %
Measured & Indicated Sulphide 722 Mt Copper 0.33 %
Measured & Indicated Oxide 790 Mt Copper 0.27 %
Inferred Sulphide 749 Mt Copper 0.27 %
Inferred Oxide 85 Mt Copper 0.21 %


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 5, 2022
....................... Subscription required ....................... Subscription required Subscription required May 5, 2022
....................... Subscription required ....................... Subscription required Subscription required May 5, 2022
....................... Subscription required ....................... Subscription required Subscription required May 5, 2022
....................... Subscription required ....................... Subscription required Subscription required May 5, 2022
....................... Subscription required ....................... Subscription required Subscription required May 24, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Sustainability Report 2016
Other 2015
Press Release 2015
Annual Report 2014
Corporate Presentation 2012
Annual Report 1998
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