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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


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 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 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 DOZ and all of Big Gossan) 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 are common. Moreover, gold occurs in significant concentrations in all of the district’s ore bodies, though rarely visible to the naked eye. These gold concentrations usually occur as inclusions within the copper sulfide minerals, though, in some deposits, these concentrations can also be strongly associated with pyrite.


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 90 pieces of mobile equipment, which includes 14 LHD units and 10 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.


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 required6,100 t3,800 t600 t900 t
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Reserves at December 31, 2021:
Cut-off grade for mineral reserves is 1.70% CuEq.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Sulphide 17 Mt Copper 2.5 %
Proven Sulphide 17 Mt Gold 1.02 g/t
Proven Sulphide 17 Mt Silver 15.56 g/t
Probable Sulphide 34 Mt Copper 2.14 %
Probable Sulphide 34 Mt Gold 0.94 g/t
Probable Sulphide 34 Mt Silver 12.72 g/t
Proven & Probable Sulphide 51 Mt Copper 2.26 % 2.3 B lbs
Proven & Probable Sulphide 51 Mt Gold 0.97 g/t 1.1 M oz
Proven & Probable Sulphide 51 Mt Silver 13.65 g/t 14.2 M oz



Heavy Mobile Equipment as of December 31, 2021:
HME TypeQuantity
Load-Haul-Dump (LHD) ....................... Subscription required
Truck (haul) ....................... 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
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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
Form 10-K 2016
Form 10-K 2015
Form 10-K 2014
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