Indonesia

Deep Ore Zone (DOZ) Mine

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Categories

Overview

Mine TypeUnderground
StatusClosing / Closed
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Block caving
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SnapshotThe Deep Ore Zone (DOZ) mine was a part of Grasberg minerals district.

The Deep Ore Zone ore body was depleted at the end of 2021.
Related AssetGrasberg Complex

Owners

SourceSource
CompanyInterestOwnership
Freeport-McMoRan Inc. 48.76 % Indirect
PT Indonesia Asahan Aluminium (Persero) 51.24 % Indirect
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 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

  • 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.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

Milling equipment has not been reported.

Processing

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Production

Combined production numbers are reported under Grasberg Complex

Operational metrics

Metrics2021202020192018201720162015
Daily milling rate  ....  Subscribe  ....  Subscribe25,500 t33,800 t31,200 t38,000 t43,700 t

Production Costs

Commodity production costs have not been reported.

Heavy Mobile Equipment

Fleet data has not been reported.

Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 21, 2024
....................... Subscription required ....................... Subscription required Subscription required Feb 21, 2024
....................... Subscription required ....................... Subscription required Subscription required Feb 22, 2024

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