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Indonesia
Grasberg Complex (Big Gossan Mine, Deep Mill Level Zone (DMLZ) Mine, Deep Ore Zone (DOZ) Mine, Grasberg Mine, Grasberg Block Cave Mine)

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 Location:
60 km NNE from Timika, Indonesia
  Regional Office:
Plaza 89, Lt. 5 Jl. HR. Rasuna Said Kav. X-7 No. 6
Jakarta
Indonesia
12940
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Fax+62-21-2591945
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Block caving
  • Blast Hole Stoping
  • Paste backfill
Mine Life2041
The Grasberg minerals district is one of the largest producing underground operations in the world.

The Grasberg minerals district includes the following underground mines that are being operated: the Grasberg Block Cave, the Deep Mill Level Zone (DMLZ) and Big Gossan.

Long-term mine development activities are ongoing for PT-FI's Kucing Liar deposit in the Grasberg minerals district, which is expected to produce over 6 billion pounds of copper and 6 million ounces of gold between 2028 and the end of 2041. Pre-production development activities commenced in 2022 and are expected to continue over an approximate 10-year timeframe.

Owners

Source: p. 6
CompanyInterestOwnership
Freeport-McMoRan Inc. 48.76 % Indirect
PT Indonesia Asahan Aluminium (Persero) 51.24 % Indirect
PT Freeport Indonesia (operator) 100 % Direct
PT Freeport Indonesia (PT-FI) is a limited liability company organized under the laws of the Republic of Indonesia. PT-FI operates the mines in the Grasberg minerals district.

Freeport-McMoRan have a 48.76 percent share ownership in PT-FI and the remaining 51.24 percent share ownership is held by PT Indonesia Asahan Aluminium (an Indonesian state-owned enterprise).

Contractors

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Deposit Type

  • Skarn
  • Vein / narrow vein
  • Porphyry

Summary:

The Grasberg minerals district is situated on the crest of the Sudirman Mountain Range at elevations over 2,500 meters with the highest peak, Puncak Jaya at 4,884 meters. Ore deposits in the Grasberg minerals district have economic copper, gold, and silver mineralization in porphyries and skarns. The primary sulfide mineralization is chalcopyrite, with lesser bornite, chalcocite, and covellite. Gold concentrations usually occur as inclusions within the copper sulfide minerals although in some parts of deposits gold can also be strongly associated with pyrite.

There are five major ore bodies all within the center of the Grasberg minerals district:
• Grasberg Intrusive Complex (GIC) includes the GBC and the depleted GRS_OP.
• EESS includes DMLZ and depleted GBT, IOZ, DOZ block caves.
• BG.
• KL (development stage mineral reserve).
• Dom (classified as mineral resource).

The ore bodies are located within and around two main igneous intrusions: the Grasberg monzodiorite and Ertsberg diorite. The host rocks of these ore bodies include both carbonate and clastic rocks that form the ridge crests and upper flanks of the Sudirman Range and the igneous rocks of monzonitic to dioritic composition that intrude them. The igneous-hosted ore bodies (GBC and portions of the DMLZ) occur as vein stockworks and disseminations of copper sulfides, dominated by chalcopyrite and to a lesser extent bornite. The sedimentary-rock hosted ore bodies (p ........

Mining Methods

  • Block caving
  • Blast Hole Stoping
  • Paste backfill

Summary:

All of the currently active operations are underground mines. The mining method for each reserve is as follows:
- Grasberg Block Cave: block/panel cave mine.
- Deep Mill Level Zone: block/panel cave mine.
- Big Gossan: open stope mine.
- Kucing Liar: block/panel cave mine.

Mine unit operations include drilling, blasting to develop access, undercuts, drawbell development, ore raise development, drawpoint development, cave initiation, as well as loading and hauling. Support equipment is used for maintaining underground access roads, underground crushers, conveyors, and other mine services.

Required underground mining equipment varies by individual operation and includes that equipment required to develop and construct the mines as well as production support. The primary mining fleet consists of a mixed fleet of load-haul-dump loaders with 10-15 metric ton capacity and haul trucks with 55 to 60 metric ton capacity.

The site infrastructure at the Grasberg minerals district has been established over the history of the project and supports the current operations. The current major mine infrastructure includes: waste rock storage facilities, temporary stockpiles, riverine tailings management system, power and electrical systems, water usage systems, various on-site warehouses and maintenance shops, and offices required for administration, engineering, maintenance and other related mine and processing operations.

Grasbe ........

Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2023202220212020201920182017
Copper M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required1,227996
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in copper conc.. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Daily ore mining rate  ......  Subscription required  ......  Subscription required
Daily milling rate  ......  Subscription required  ......  Subscription required87,700 t110,100 t178,100 t140,400 t
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Reserves at December 31, 2022:
Mineral Reserves Cut-off grades: Grasberg Block Cave - 0.54% CuEq, DMLZ - 0.63% CuEq, Big Gossan - 1.7% CuEq, Kucing Liar - 0.60% CuEq.
Mineral Resources Cut-off grades: - 0.50% CuEq.

CategoryOreTypeTonnage CommodityGradeContained MetalRecoverable Metal
Proven & Probable Sulphide 1,621 Mt Copper 1.03 % M lbs 30,833 M lbs
Proven & Probable Sulphide 1,621 Mt Gold 0.76 g/t koz 26,295 koz
Proven & Probable Sulphide 1,621 Mt Silver 4.12 g/t koz 121,299 koz
Measured & Indicated Sulphide 2,903 Mt Copper 0.7 % 45,057 M lbs
Measured & Indicated Sulphide 2,903 Mt Gold 0.58 g/t 54,450 koz
Measured & Indicated Sulphide 2,903 Mt Silver 3.9 g/t 364,006 koz
Inferred Sulphide 353 Mt Copper 0.46 % 3,619 M lbs
Inferred Sulphide 353 Mt Gold 0.39 g/t 4,438 koz
Inferred Sulphide 353 Mt Silver 2.69 g/t 30,578 koz
Total Resource Sulphide 3,256 Mt Copper 0.68 % 48,676 M lbs
Total Resource Sulphide 3,256 Mt Gold 0.56 g/t 58,888 koz
Total Resource Sulphide 3,256 Mt Silver 3.77 g/t 394,584 koz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Credits (by-product) Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -2.69 / lb   -2.05 / lb  
Total cash costs Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.1 / lb   1.27 / lb  
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 478 / oz   542 / oz  
Total cash costs Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -0.58 / lb†   0.09 / lb†  
† Net of By-Product.
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Financials:

Units2022202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,001   875   1,025  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 6,288   4,946   3,802  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 2,966   2,020   1,027  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 3,089   2,146   1,117  
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Pipelines and Water Supply
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 3, 2023
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015
Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
Form 10-K 2022
Technical Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Form 10-K 2018
Press Release 2018
Form 10-K 2017
Form 10-K 2016
Form 10-K 2015
Form 10-K 2014
Form 10-K 2013
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