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

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 Location:
58 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
WebsiteWeb
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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
Processing
  • Gravity separation
  • Flotation
Mine Life2022


Owners

Source: p. 18
CompanyInterestOwnership
Freeport-McMoRan Inc. 48.76 % Indirect
PT Indonesia Asahan Aluminium (Persero) 51.24 % Indirect
PT Freeport Indonesia 100 % Direct
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).

Deposit Type

  • Skarn
  • Breccia pipe / Stockwork


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

  • Gravity separation
  • Flotation

Source: Subscription required

Summary:

The mill produces copper and gold concentrate from mined ore through a process to separate valuable minerals from the impurities covering them. The main steps in the process are crushing, grinding, flotation, and dewatering. Crushing and grinding transform ore size into fine sand in order to release particles containing copper and gold.

Flotation is a separation process to produce copper-gold concentrate. Concentrate slurry consisting of finely ground ore and water mixed with reagents is introduced into a series of mixing tanks called flotation cells, where air is pumped into the slurry.

The reagents used are lime, frothers and collectors. Frothers form stable bubbles that float to the surface of the flotation cell as froth. Collectors react with valuable metal sulfide mineral particle surfaces. rendering these surfaces hydrophobic. The hydrophobic sulfide mineral particles adhere to the air bubbles rising from the slurry zone into the froth floating on the surfac ........


Combined production numbers are reported under Grasberg Complex

Operational Metrics:

Metrics201920182017201620152014
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required38,000 t43,700 t50,500 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryOreTypeTonnage CommodityGradeRecoverable Metal
Proven Mill / Sulphide 8 Mt Copper 0.55 %
Proven Mill / Sulphide 8 Mt Gold 0.56 g/t
Proven Mill / Sulphide 8 Mt Silver 2.6 g/t
Probable Mill / Sulphide 21 Mt Copper 0.48 %
Probable Mill / Sulphide 21 Mt Gold 0.45 g/t
Probable Mill / Sulphide 21 Mt Silver 2.41 g/t
Proven & Probable Mill / Sulphide 29 Mt Copper 0.5 % 0.3 B lbs
Proven & Probable Mill / Sulphide 29 Mt Gold 0.48 g/t 0.4 M oz
Proven & Probable Mill / Sulphide 29 Mt Silver 2.46 g/t 1.5 M oz


Heavy Mobile Equipment as of December 31, 2019:
HME TypeSizeQuantity
Load-Haul-Dump (LHD) 11 t 40
Truck (haul) 55 t 19

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 5, 2020
....................... Subscription required ....................... Subscription required Subscription required Mar 5, 2020
....................... Subscription required ....................... Subscription required Subscription required Mar 5, 2020
....................... Subscription required ....................... Subscription required Subscription required Mar 5, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2018
Form 10-K 2017
Form 10-K 2016
Form 10-K 2015
Form 10-K 2014
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Aerial view:

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