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Indonesia
Big Gossan Mine (Grasberg Complex)

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 Location:
60 km NE from Timika, Indonesia

  Regional Office:
Plaza 89, Lt. 5 Jl. HR. Rasuna Said Kav. X-7 No. 6
Jakarta
Indonesia
12940
Phone  ...  Subscription required
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
  • Blast Hole Stoping
  • Paste backfill
Production Start...
Mine Life2041
The Big Gossan (BG) ore body lies underground and adjacent to the current mill site.


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 has 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
  • Sediment-hosted


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 Big Gossan mine is a tabular, near vertical ore body with approximate dimensions of 1,200 meters along strike and 800 meters down dip with varying thicknesses from 20 meters to 120 meters. The sedimentary-rock hosted ore bodies (portions of the DMLZ, KL and all of the BG) occur as “magnetite-rich, calcium/magnesian skarn” replacements, whose location and orientation are strongly influenced by major faults and by the chemistry of the carbonate rocks along the margins of the intrusions. The copper mineralization in these skarn deposits is dominated by chalcopyrite, but higher bornite concentrations a ........


Mining Methods

  • Blast Hole Stoping
  • Paste backfill


Summary:

The Big Gossan ore body lies underground and adjacent to the current mill site. It is a tabular, near vertical ore body with approximate dimensions of 1,200 meters along strike and 800 meters down dip with varying thicknesses from 20 meters to 120 meters. The mine utilizes a blasthole stoping method with delayed paste backfill. Stopes of varying sizes are mined and the ore dropped down passes to a truck haulage level. Trucks are chute loaded and transport the ore to a jaw crusher. The crushed ore is then hoisted vertically via a two-skip production shaft to a level where it is loaded onto a conveyor belt. The belt carries the ore to one of the main underground conveyors where the ore is transferred and conveyed to the surface stockpiles for processing.

The Big Gossan fleet consists of over 80 pieces of mobile equipment, which include 13 LHD units and 7 haul trucks used in development and production activities.

In 2015, Freeport asked for a RCT specialist to be deployed permanently on-site to provide a high level of support for the extensive range of automation solutions implemented across the mines.

These solutions include deploying the ControlMaster semi-autonomous technology on Cat R1700 and R2900 loaders, which can be managed by operators in Freeport’s central Remote Operation Room (ROR) on the mine’s surface.

Other projects include automating 24 chute systems spread across the Big Gossan, DOZ and DMLZ mines and relocating the c ........


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:

Metrics202220212020201920182017
Daily ore mining rate  ......  Subscription required  ......  Subscription required
Daily milling rate  ......  Subscription required  ......  Subscription required7,000 t6,100 t3,800 t600 t
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Reserves at December 31, 2022:
Cut-off grade for mineral reserves is 1.70% CuEq.
Cut-off grade for mineral resources is 0.98% CuEq.

CategoryOreTypeTonnage CommodityGradeContained MetalRecoverable Metal
Proven & Probable Sulphide 49 Mt Copper 2.27 % M lbs 2,225 M lbs
Proven & Probable Sulphide 49 Mt Gold 0.95 g/t koz 1,011 koz
Proven & Probable Sulphide 49 Mt Silver 13.76 g/t koz 13,746 koz
Measured & Indicated Sulphide 24 Mt Copper 1.21 % 646 M lbs
Measured & Indicated Sulphide 24 Mt Gold 0.66 g/t 512 koz
Measured & Indicated Sulphide 24 Mt Silver 8 g/t 6,237 koz



Heavy Mobile Equipment:
HME TypeModelQuantityRef. Date
Backhoe ....................... Subscription required Dec 31, 2018
Cable bolter ....................... Subscription required Dec 31, 2018
Drill ....................... Subscription required ....................... Subscription required Dec 31, 2018
Drill ....................... Subscription required ....................... Subscription required Dec 31, 2022
Grader ....................... Subscription required Dec 31, 2018
Jumbo ....................... Subscription required ....................... Subscription required Dec 31, 2018
Load-Haul-Dump (LHD) ....................... Subscription required Dec 31, 2022
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required Dec 31, 2022
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required Dec 31, 2022
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required Dec 31, 2022
Scissor Lift ....................... Subscription required Dec 31, 2018
Shotcreter ....................... Subscription required Dec 31, 2018
Telescopic Handler ....................... Subscription required Dec 31, 2018
Trans Mixer ....................... Subscription required ....................... Subscription required Dec 31, 2018
Truck (boom) ....................... Subscription required Dec 31, 2018
Truck (haul) ....................... Subscription required Dec 31, 2022
Truck (underground) ....................... Subscription required ....................... Subscription required Dec 31, 2018
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 4, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 4, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 4, 2023
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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
Other 2018
Form 10-K 2017
Form 10-K 2016
Form 10-K 2015
Form 10-K 2014
Press Release 2011
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