Overview
| Status | Closing / Closed |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
| Mine Life | 2022 |
The Deep Ore Zone ore body y was depleted at the end of 2021. |
Source:
p. 4
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.
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.
Source:
Summary:
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Combined production numbers are reported under
Grasberg Complex
Operational Metrics:
| Metrics | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|
Daily milling rate
| ...... | ...... | 25,500 t | 33,800 t | 31,200 t | 38,000 t |
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Reserves at December 31, 2020:
Cut-off grade is 0.91 % CuEq.
| Category | OreType | Tonnage | Commodity | Grade | Recoverable 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 Type | Size | Quantity |
|
Load-Haul-Dump (LHD)
|
11 t
|
.......................
|
|
Truck (haul)
|
55 t
|
.......................
|
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Corporate Filings & Presentations:
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