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Indonesia
Grasberg Block Cave Mine (Grasberg Complex)

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 Location:
56 km NE 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
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Block caving
Mine Life2041
As existing drawpoints mature and additional drawpoints are added, cave expansion is expected to accelerate production rates to an average of over 105,000 metric tons of ore per day in 2022 and 122,000 metric tons of ore per day in 2023 from five production blocks spanning 335,000 square meters. As of December 31, 2021, the Grasberg Block Cave underground mine had 336 open drawbells.


Owners

Source: p. 4
CompanyInterestOwnership
Freeport-McMoRan Inc. 48.76 % Indirect
PT Indonesia Asahan Aluminium (Persero) 51.24 % Indirect
PT-FI is a limited liability company organized under the laws of the Republic of Indonesia. 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
  • Breccia pipe / Stockwork


Summary:

In Grasberg Block Cave (GBC) Mine area, anhydrite-gypsum and sulfur mineral distribution can be traced in Grasberg Intrusive Complex (GIC), skarn, and Heavy Sulphide Zone (HSZ). GIC and Skarn contain abundant of anhydritegypsum as product of alteration. Potassic alteration in GIC are characterized by anhydrite appearance within the rock or as intense stockwork veins associate with quartz-pyritechalcopyrite. In the skarn, anhydrite mineral appear as dominant alteration mineral especially if the skarn occurred between contact of igneous rock and Waripi Dolomite with enough temperature to form anhydrite. Not only within the rock anhydrite also as vein and fill the fracture associated with suphide mineral pyritechalcopyrite. This anhydrite add by water become gypsum as result. Gypsum is easier to dissolve in water so can caused high sulfate content in water. Both potassic alteration GIC and skarn contain gypsum associated with 3-5% pyrite and 1-2% chalcopyrite content as disseminated. Even locally up to 5-10% pyrite and 3% chalcopyrite also minor sphalerite as replacement sulphide alteration or intense patchy.

Heavy Sulphide Zone in GBC area is characterized by more than 20% pyrite content and strong-pervasive replacement sulphide alteration. Locally pyrite content could up to more than 50%. The dominant sulphide content comprises of pyrite-chalcopyrite-pyrhotitesphalerite and easily oxidized if contact with ground water especially for pyrite.


Mining Methods

  • Block caving


Summary:

The Grasberg Block Cave ore body is the same ore body historically mined from the surface in the Grasberg open pit. Undercutting, drawbell construction and ore extraction activities in the Grasberg Block Cave underground mine continue to track expectations. Monitoring data on cave propagation in the Grasberg Block Cave underground mine is providing confidence in growing production rates over time. As existing drawpoints mature and additional drawpoints are added, cave expansion is expected to accelerate production rates to an average of over 105,000 metric tons of ore per day in 2022 and 122,000 metric tons of ore per day in 2023 from five production blocks spanning 335,000 square meters. As of December 31, 2021, the Grasberg Block Cave underground mine had 336 open drawbells.

The Grasberg Block Cave fleet consists of approximately 580 pieces of mobile equipment. The primary mining equipment directly associated with production and development includes an available fleet of 88 LHD units and 33 haul trucks. Each production LHD unit typically carries approximately 11 metric tons of ore and transfers ore into the rail haulage system.


Crushing and Grinding
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Processing

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Summary:

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Combined production numbers are reported under Grasberg Complex

Operational Metrics:

Metrics202120202019201820172016
Daily milling rate  ......  Subscription required  ......  Subscription required8,600 t4,000 t3,600 t2,700 t
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Reserves at December 31, 2021:
Mineral Reserves Cut-off grade is 0.63 % CuEq.
Mineral Resources Cut-off grade is 0.51 % CuEq.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Sulphide 316 Mt Copper 1.15 % 6,694 M lbs
Proven Sulphide 316 Mt Gold 0.76 g/t 4,927 koz
Proven Sulphide 316 Mt Silver 3.61 g/t 20,450 koz
Probable Sulphide 541 Mt Copper 1.01 % 10,051 M lbs
Probable Sulphide 541 Mt Gold 0.69 g/t 7,636 koz
Probable Sulphide 541 Mt Silver 3.87 g/t 37,486 koz
Proven & Probable Sulphide 857 Mt Copper 1.06 % 16,746 M lbs
Proven & Probable Sulphide 857 Mt Gold 0.71 g/t 12,563 koz
Proven & Probable Sulphide 857 Mt Silver 3.78 g/t 57,936 koz
Measured & Indicated Sulphide 831 Mt Copper 0.63 % 11,510 M lbs
Measured & Indicated Sulphide 831 Mt Gold 0.52 g/t 13,804 koz
Measured & Indicated Sulphide 831 Mt Silver 2.85 g/t 94,850 koz
Inferred Sulphide 24 Mt Copper 0.23 % 122 M lbs
Inferred Sulphide 24 Mt Gold 0.34 g/t 268 koz
Inferred Sulphide 24 Mt Silver 2.85 g/t 2,213 koz
Total Resource Sulphide 855 Mt Copper 0.62 % 11,632 M lbs
Total Resource Sulphide 855 Mt Gold 0.51 g/t 14,072 koz
Total Resource Sulphide 855 Mt Silver 3.53 g/t 97,063 koz



Heavy Mobile Equipment as of December 31, 2021:
HME TypeSizeQuantity
Load-Haul-Dump (LHD) 11 t ....................... Subscription required
Truck (haul) 60 t ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Form 10-K 2018
Form 10-K 2017
Corporate Presentation 2016
Other 2016
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