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Indonesia
Deep Ore Zone (DOZ) Mine (Grasberg Complex)

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 Location:
58 km NE from Timika, Indonesia

  Address:
Plaza 89, Lt. 5 Jl. HR. Rasuna Said Kav. X-7 No. 6
Jakarta
Indonesia
12940
Phone  ...  Subscription required
Fax+62-21-2591945
EmailEmail
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusClosing / Closed
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Block caving
Production Start...
Mine Life2022
The Deep Ore Zone ore body y was depleted at the end of 2021.


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

  • Breccia pipe / Stockwork
  • Skarn


Summary:

The igneous-hosted ore bodies (the Grasberg open pit and block cave, and portions of the DOZ block cave) occur as vein stockworks and disseminations of copper sulfides, dominated by chalcopyrite and, to a lesser extent, bornite. The sedimentary-rock hosted ore bodies (portions of the DOZ and all of the 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

  • Block caving


Summary:

The DOZ ore body lies vertically below the now depleted Intermediate Ore Zone. PT-FI began production from the DOZ ore body in 1989 using open-stope mining methods, but suspended production in 1991 in favor of production from the Grasberg open pit. Production resumed in 2000 using the block-cave method and is at the 3,110-meter elevation level.

The DOZ is a mature block-cave mine that previously operated at 80,000 metric tons of ore per day. Current operating rates from the DOZ underground mine are driven by the value of the incremental DOZ ore grade compared to the ore from the DMLZ and Grasberg Block Cave underground mines.

The DOZ fleet consists of 186 pieces of mobile equipment. The primary mining equipment directly associated with production includes an available fleet of 40 LHD units and 19 haul trucks. The trucks dump into two gyratory crushers, and the ore is then conveyed to the surface stockpiles for processing.


Crushing and Grinding


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 required25,500 t33,800 t31,200 t38,000 t
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Reserves at December 31, 2020:
Cut-off grade is 0.91 % CuEq.

CategoryOreTypeTonnage CommodityGradeRecoverable Metal
Proven Sulphide 2 Mt Copper 0.59 %
Proven Sulphide 2 Mt Gold 0.54 g/t
Proven Sulphide 2 Mt Silver 2.62 g/t
Probable Sulphide 6 Mt Copper 0.54 %
Probable Sulphide 6 Mt Gold 0.45 g/t
Probable Sulphide 6 Mt Silver 2.62 g/t
Proven & Probable Sulphide 8 Mt Copper 0.55 % 100 M lbs
Proven & Probable Sulphide 8 Mt Gold 0.47 g/t 100 koz
Proven & Probable Sulphide 8 Mt Silver 2.62 g/t 400 koz



Heavy Mobile Equipment as of December 31, 2020:
HME TypeSizeQuantity
Load-Haul-Dump (LHD) 11 t ....................... Subscription required
Truck (haul) 55 t ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 25, 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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