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Chile
Sierra Gorda Mine

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 Location:
61 km SW from Calama, Chile

  Address:
General Borgoño 934 Piso 1 y 10
Antofagasta
Chile
Fax+56 (55) 2684 008
WebsiteWeb
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  • Mining
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Molybdenum
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life22 years (as of Jan 1, 2021)


Owners

Source: p. 140
CompanyInterestOwnershipInvestor's Info
South32 Limited 45 % Indirect
KGHM Polska Miedz S.A. 55 % Indirect
Sierra Gorda S.C.M. (operator) 100 % Direct
On 22 February 2022 the transaction was concluded for sale of the 45% share in the company Sierra Gorda S.C.M. by Sumitomo Metal Mining Co., Ltd. and Sumitomo Corporation to South32.

KGHM Polska Miedz S.A. hold 55% of the company Sierra Gorda S.C.M.

Contractors

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Deposit Type

  • Porphyry
  • Hydrothermal


Summary:

Deposit Geology
The Sierra Gorda is controlled by a block of continuous concessions that cover an area of approximately 7.5 km by 5 km. The SGP is located within the Sierra Gorda mining district (about 15 km by 10 km extension) where numerous mineral occurrences have been identified in hydrothermal alteration zones with copper, molybdenum, and gold.

The Sierra Gorda Mining District is hosted by rocks of Early Cretaceous age consisting of a sequence of andesites. These rocks outcrop around the project’s district except to the west. These rocks occur as coarse-to-fine- grained porphyritic andesites and andesite flows with intercalated agglomerates, tuffs, sandstones, and siltstones. These rocks have been correlated to the Quebrada Seca Formation, which was dated as 111 ± 3 million years old.

The Sierra Gorda Mining District also encloses Paleocene intrusives represented by plutonic rocks of variable composition from monzodiorite, granodiorite to granite which are apparently related to the underlying Batholith.

Late stage intrusives also occur in the Sierra Gorda Mining District; these are represented by irregular stocks, dikes and small plugs intruding both, the batholith and the andesites.

Numerous breccia zones occur within the Sierra Gorda Mining District. The main Sierra Gorda mineral deposits are associated with breccia zones, such as the Catalina or Santiaguina, Salvadora, Olvidada, Copucha, and the newly discovered 28 ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Since the SGP deposit is near surface, open pit mining has been selected and large scale equipment has been chosen to increase performance.

The mine is a conventional open-pit operation which is carried out through drilling and blasting, loading shovels, and land transport using heavy haul trucks that take the ore to the crushing area and the tailings to the dumps.

The Sierra Gorda sulfide deposit is a large, deep, multi-metallic deposit including copper as main product, molybdenum and gold as by-products.

Design Parameters:
- Bench Height - 16m
- Minimum Mining Width - 100m
- Ramp Width - 35-38m
- Maximum Grade - 10%.

The final pit will have a length of 2,700 m by 2,500 m width and a depth of 800 m from its original surface.

The waste dumps are located to the north, east and south of the pit and are set back approximately 500 meters from the pit rim to allow for pit expansion in the event metals prices increase. The dumps include an area to hold the oxide material for possible future processing.


Crushing and Grinding
Source: Subscription required

- subscription is required.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2021202020192018201720162015
Copper kt  ......  Subscription required  ......  Subscription required  ......  Subscription required97979484
Molybdenum M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20212020201920182017
Daily processing rate  ......  Subscription required  ......  Subscription required115 kt
Tonnes milled  ......  Subscription required  ......  Subscription required42 Mt40 Mt37 Mt
Daily processing capacity  ......  Subscription required  ......  Subscription required110,000 t
Annual production capacity  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at October 31, 2014:

CategoryTonnage CommodityGradeContained Metal
Proven 343,882 kt Copper 0.41 % 1,409,916 t
Proven 343,882 kt Molybdenum 0.03 % 103,165 t
Proven 343,882 kt Gold 0.07 g/t 24,071 kg
Probable 1,110,307 kt Copper 0.4 % 4,441,225 t
Probable 1,110,307 kt Molybdenum 0.02 % 222,061 t
Probable 1,110,307 kt Gold 0.06 g/t 66,618 kg
Proven & Probable 1,454,189 kt Copper 0.4 % 5,851,141 t
Proven & Probable 1,454,189 kt Molybdenum 0.02 % 325,227 t
Proven & Probable 1,454,189 kt Gold 0.06 g/t 90,689 kg
Measured 364,551 kt Copper 0.41 % 1,487,369 t
Measured 364,551 kt Molybdenum 0.03 % 105,720 t
Measured 364,551 kt Gold 0.07 g/t 25,154 kg
Indicated 1,242,064 kt Copper 0.4 % 4,930,991 t
Indicated 1,242,064 kt Molybdenum 0.02 % 235,993 t
Indicated 1,242,064 kt Gold 0.06 g/t 73,282 kg
Measured & Indicated 1,606,615 kt Copper 0.4 % 6,418,360 t
Measured & Indicated 1,606,615 kt Molybdenum 0.02 % 341,713 t
Measured & Indicated 1,606,615 kt Gold 0.06 g/t 98,436 kg
Inferred 83,702 kt Copper 0.35 % 292,958 t
Inferred 83,702 kt Molybdenum 0.01 % 5,022 t
Inferred 83,702 kt Gold 0.04 g/t 3,180 kg

Commodity Production Costs:

CommodityUnits202120202019201820172016
C1 cash costs Copper USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1.31 / lb†   1.67 / lb†   1.96 / lb†  
† Net of By-Product.
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Financials:

Units202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 287   274   268  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 978   968   639  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -385  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 318  
Operating Cash Flow M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required



Heavy Mobile Equipment:
HME TypeModelSizeQuantityLeased or
Contractor
Ref. Date
Drill ....................... Subscription required 16 inch ....................... Subscription required Leased Aug 4, 2014
Drill ....................... Subscription required 16 inch ....................... Subscription required Leased Aug 4, 2014
Loader ....................... Subscription required 40.5 cu. m ....................... Subscription required Leased Aug 4, 2014
Shovel ....................... Subscription required ....................... Subscription required Leased Dec 31, 2021
Shovel ....................... Subscription required 90 t ....................... Subscription required Leased Aug 4, 2014
Truck (haul) ....................... Subscription required 303 t ....................... Subscription required Leased Aug 4, 2014
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 20, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 20, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 20, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 20, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 20, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 20, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Financial Review 2018
Annual Report 2017
Annual Report 2016
Annual Report 2015
Annual Report 2015
Annual Report 2014
Corporate Presentation 2014
Year-end Mineral Reserves 2014
Technical Report 2011
Technical Report 2011
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