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Indonesia
Deep Mill Level Zone (DMLZ) Mine (Grasberg Complex)

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 Location:
60 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

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Block caving
Mine Life2041
The DMLZ has continued its ramp-up of production. As of December 31, 2021, the DMLZ underground mine had 174 open drawbells.


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 has 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

  • Skarn
  • Porphyry


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.


Mining Methods

  • Block caving


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 approximately 68,000 metric tons of ore per day in 2022 and 69,000 metric tons of ore per day in 2023 from three production blocks. As of December 31, 2021, the DMLZ underground mine had 174 open drawbells. The DMLZ fleet consists of over 390 pieces of mobile equipment, which includes 63 LHD units and 34 haul trucks used in production and development activities. Each production LHD unit typically carries approximately 11 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.


Crushing and Grinding


Processing

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Summary:

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Combined production numbers are reported under Grasberg Complex

Operational Metrics:

Metrics202220212020201920182017
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required9,800 t3,200 t3,200 t
^ Guidance / Forecast.
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Reserves at December 31, 2021:
Mineral Reserves Cut-off grade 0.71 % CuEq.
Mineral Resources Cut-off grade 0.58 % CuEq.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Sulphide 91 Mt Copper 0.89 % 1,527 M lbs
Proven Sulphide 91 Mt Gold 0.79 g/t 1,825 koz
Proven Sulphide 91 Mt Silver 4.21 g/t 7,922 koz
Probable Sulphide 321 Mt Copper 0.84 % 5,032 M lbs
Probable Sulphide 321 Mt Gold 0.71 g/t 5,794 koz
Probable Sulphide 321 Mt Silver 4.03 g/t 26,620 koz
Proven & Probable Sulphide 412 Mt Copper 0.85 % 6,559 M lbs
Proven & Probable Sulphide 412 Mt Gold 0.73 g/t 7,619 koz
Proven & Probable Sulphide 412 Mt Silver 4.07 g/t 34,542 koz
Measured & Indicated Sulphide 546 Mt Copper 0.67 % 8,075 M lbs
Measured & Indicated Sulphide 546 Mt Gold 0.57 g/t 10,091 koz
Measured & Indicated Sulphide 546 Mt Silver 3.44 g/t 60,389 koz
Inferred Sulphide 74 Mt Copper 0.66 % 1,088 M lbs
Inferred Sulphide 74 Mt Gold 0.42 g/t 999 koz
Inferred Sulphide 74 Mt Silver 3.05 g/t 7,291 koz
Total Resource Sulphide 620 Mt Copper 0.67 % 9,163 M lbs
Total Resource Sulphide 620 Mt Gold 0.56 g/t 11,090 koz
Total Resource Sulphide 620 Mt Silver 3.39 g/t 67,681 koz



Heavy Mobile Equipment as of December 31, 2021:
HME TypeQuantity
Load-Haul-Dump (LHD) ....................... Subscription required
Truck (haul) ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 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
Other 2017
Corporate Presentation 2016
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