Overview
| Stage | Production |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
| Mine Life | 2041 |
The Deep Mill Level Zone (DMLZ) has continued its ramp-up of production. Ongoing hydraulic fracturing operations combined with continued undercutting and drawbell openings in the two currently active production blocks are expected to expand the cave, supporting higher production rates that are expected to average nearly 80,000 metric tons of ore per day in both 2023 and 2024 from three production blocks. As of December 31, 2022, the DMLZ underground mine had 207 open drawbells. |
Source:
p. 6
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).
Contractors
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Summary:
The Grasberg minerals district is situated on the crest of the Sudirman Mountain Range at elevations over 2,500 meters with the highest peak, Puncak Jaya at 4,884 meters. Ore deposits in the Grasberg minerals district have economic copper, gold, and silver mineralization in porphyries and skarns. The primary sulfide mineralization is chalcopyrite, with lesser bornite, chalcocite, and covellite. Gold concentrations usually occur as inclusions within the copper sulfide minerals although in some parts of deposits gold can also be strongly associated with pyrite.
There are five major ore bodies all within the center of the Grasberg minerals district:
• Grasberg Intrusive Complex (GIC) includes the GBC and the depleted GRS_OP.
• EESS includes DMLZ and depleted GBT, IOZ, DOZ block caves.
• BG.
• KL (development stage mineral reserve).
• Dom (classified as mineral resource).
The DMLZ ore body lies below the Deep Ore Zone (DOZ) underground mine at the 2,590-meter elevation and represents the downward continuation of mineralization in the Ertsberg East Skarn system and neighboring Ertsberg porphyry.
The igneous-hosted ore bodies (the Grasberg Block Cave and portions of the DMLZ) 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 DMLZ and Kucing Liar and all of the Big Gossan) occur as “magnetite-rich, calcium/magnesian skarn” replacements, whose loca ........
Summary:
The DMLZ ore body lies below the DOZ underground mine at the 2,590-meter elevation and represents the downward continuation of mineralization in the Ertsberg East Skarn system and neighboring Ertsberg porphyry.
The DMLZ has continued its ramp-up of production. Hydraulic fracturing operations have been effective in managing rock stresses and pre-conditioning the cave following mining-induced seismic activity experienced from time to time. Ongoing hydraulic fracturing operations combined with continued undercutting and drawbell openings in the two currently active production blocks are expected to expand the cave, supporting higher production rates that are expected to average nearly 80,000 metric tons of ore per day in both 2023 and 2024 from three production blocks. As of December 31, 2022, the DMLZ underground mine had 207 open drawbells.
The DMLZ fleet consists of over 400 pieces of mobile equipment, which includes 60 LHD units and 36 haul trucks used in production and development activities. Each production LHD unit typically carries approximately 9 metric tons of ore and transfers ore into the truck haulage system. The haul trucks have a capacity of 55 to 60 metric tons and load ore from chutes fed by the LHDs and transfer it to one of two gyratory crushers. The crushed ore is conveyed to surface stockpiles for processing.
Source:
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Flow Sheet:
Summary:
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Combined production numbers are reported under
Grasberg Complex
Operational Metrics:
| Metrics | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 |
|
Daily ore mining rate
| ...... | ...... | ...... | | | |
|
Daily milling rate
| ...... | ...... | ...... | 28,600 t | 9,800 t | 3,200 t |
^ Guidance / Forecast.
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Reserves at December 31, 2022:
Mineral Reserves Cut-off grade 0.63 % CuEq.
Mineral Resources Cut-off grade: In-Situ - 0.53 % CuEq; Overpull - 0.40 % CuEq.
| Category | OreType | Tonnage | Commodity | Grade | Contained Metal | Recoverable Metal |
|
Proven & Probable
|
Sulphide
|
382 Mt
|
Copper
|
0.75 %
|
M lbs
|
5,362 M lbs
|
|
Proven & Probable
|
Sulphide
|
382 Mt
|
Gold
|
0.62 g/t
|
koz
|
5,922 koz
|
|
Proven & Probable
|
Sulphide
|
382 Mt
|
Silver
|
3.64 g/t
|
koz
|
28,608 koz
|
|
Measured & Indicated
|
Sulphide
|
661 Mt
|
Copper
|
0.64 %
|
9,273 M lbs
|
|
|
Measured & Indicated
|
Sulphide
|
661 Mt
|
Gold
|
0.57 g/t
|
12,069 koz
|
|
|
Measured & Indicated
|
Sulphide
|
661 Mt
|
Silver
|
3.33 g/t
|
70,722 koz
|
|
|
Inferred
|
Sulphide
|
204 Mt
|
Copper
|
0.53 %
|
2,376 M lbs
|
|
|
Inferred
|
Sulphide
|
204 Mt
|
Gold
|
0.4 g/t
|
2,646 koz
|
|
|
Inferred
|
Sulphide
|
204 Mt
|
Silver
|
2.7 g/t
|
17,721 koz
|
|
|
Total Resource
|
Sulphide
|
865 Mt
|
Copper
|
0.61 %
|
11,650 M lbs
|
|
|
Total Resource
|
Sulphide
|
865 Mt
|
Gold
|
0.53 g/t
|
14,715 koz
|
|
|
Total Resource
|
Sulphide
|
865 Mt
|
Silver
|
3.18 g/t
|
88,444 koz
|
|
Heavy Mobile Equipment as of December 31, 2022:
| HME Type | Size | Quantity |
|
Load-Haul-Dump (LHD)
|
9 t
|
.......................
|
|
Truck (haul)
|
|
.......................
|
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Corporate Filings & Presentations:
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