Skip to main content

  • ABOUT US
    • OVERVIEW
    • HISTORY
    • COPPER AT A GLANCE
    • CORPORATE GOVERNANCE
      • Board of Directors
      • Leadership
      • Board Advisors
      • Governance Documents
        • Business Ethics Policies
      • Board Committees and Charters
      • Contact the Board
    • MULTIMEDIA LIBRARY
    • OUR RESPONSE TO COVID-19
      • Company Covid-19 Information
      • The Power of Protection
      • Communities and Health Services
        • North America
        • South America
        • Indonesia
  • OPERATIONS
    • NORTH AMERICA
      • Morenci
      • Bagdad
      • Sierrita
      • Miami
      • Safford
      • Chino
      • Tyrone
      • Henderson
      • Climax
    • SOUTH AMERICA
      • Cerro Verde
      • El Abra
    • INDONESIA
      • Grasberg
  • INVESTORS
    • NEWS RELEASES
    • PRESENTATIONS
    • STOCK & DIVIDEND INFORMATION
      • Stock Quote
      • Dividend History
    • FINANCIAL INFORMATION
      • Annual Reports & Proxies
      • SEC Filings
      • Quarterly Earnings Reports
    • INVESTOR RESOURCES
      • Shareholder FAQs
      • Set Email Alerts
      • Request Information
      • RSS Feeds
  • SUSTAINABILITY
    • OUR APPROACH
      • Governance
      • Principles of Business Conduct
      • Policies & Practices
      • Stakeholder Engagement
      • Voluntary Memberships & Commitments
      • Defining Responsible Production
      • The Risk Register
      • Economic Value Contributed
      • Performance Targets
    • BUSINESS INTEGRITY
      • Anti-Corruption
      • Political Engagement
      • Transparency of Government Payments
      • Responsible Value Chains
      • Compliance Line
    • PEOPLE
      • Health & Safety
      • Human Rights
        • Due Diligence
        • Voluntary Principles
        • UK Modern Slavery Act Statement
      • Workforce
        • Inclusion & Diversity
        • Local Hiring & Skills Development
        • Employee Engagement
        • Labor Relations
      • Communities
        • Community Engagement & Social Investments
        • Assessing & Managing Impacts
        • Public Health
        • Artisanal Mining
        • Freeport in My Community
      • Indigenous Peoples
        • Land Use and Customary Rights
    • ENVIRONMENT
      • Environmental
      • Climate
      • Water Stewardship
      • Tailings Management
        • Tailings Management and Stewardship
      • Biodiversity
      • Mine Closure & Reclamation
      • Waste Mangagement
    • REPORTS AND DOCUMENTS
      • 2019 Annual Report On Sustainability
      • Climate Report
      • Voluntary Principles on Security & Human Rights
      • ESG Performance Data
      • External Assurance Statement
      • UK Modern Slavery Act Statement
      • GRI Content Index
  • CAREERS
  • FEATURES
NYSE: FCX
  • OVERVIEW
  • NORTH AMERICA
  • SOUTH AMERICA
  • INDONESIA
    • GRASBERG
COPPER (CU)
GOLD (AU)
  • #grasberg_link

     

    /sites/fcx/files/images/operations/modal-bgs/herograsberg-.jpg
    INDONESIA

    GRASBERG MINE LOCATED IN PAPUA, INDONESIA

    Description

    The Grasberg minerals district includes open-pit and underground mines.

    Did you know?

    PT Freeport Indonesia (PT-FI) commenced mining operations in 1972 and in 1988 discovered the Grasberg mine. Today, after significant production, the Grasberg mining district contains one of the world’s largest recoverable copper reserve and the largest gold reserve.

    Location

    The remote highlands of the Sudirman Mountain Range in the province of Papua, Indonesia, which is on the western half of the island of New Guinea.

    Processes and facilities

    The Grasberg minerals district has three operating mines, the Grasberg open pit, the Deep Ore Zone (DOZ) underground mine and the Big Gossan underground mine. In September 2015, PT-FI initiated pre-commercial production, which represents ore extracted during the development phase for the purpose of obtaining access to the ore body, at the Deep Mill Level Zone (DMLZ) underground mine. PT-FI also has several projects in progress in the Grasberg minerals district related to the development of the large-scale, long-lived, high-grade underground ore bodies located beneath and nearby the Grasberg open pit. In aggregate, these underground ore bodies are expected to produce large-scale quantities of copper and gold following the transition from the Grasberg open pit operations where PT-FI is currently mining the final phase. 

    Grasberg open pit. PT-FI began open-pit mining of the Grasberg ore body in 1990 and is currently mining the final phase of the Grasberg open pit, which contains high copper and gold ore grades. PT-FI expects to mine high-grade ore over the next several quarters prior to transitioning to the Grasberg Block Cave underground mine in the first half of 2019. Production from the ore stockpiles, which are located outside of the pit limits, is expected to continue through the end of 2019.

    DOZ underground mine. 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 September 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 Grasberg open pit and ore grade material from the development of the DMLZ and Grasberg Block Cave underground mines. Ore milled from the DOZ underground mine averaged 33,800 metric tons of ore per day in 2018, and production at the DOZ underground mine is expected to continue through 2022.

    DMLZ underground mine. 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. During third-quarter 2018, PT-FI commenced hydraulic fracturing activities to manage rock stresses and pre-condition the DMLZ underground mine for large-scale production following mining induced seismic activity experienced in 2017 and 2018. Results to date have been effective in managing rock stresses and pre-conditioning the cave. PT-FI expects to commence the ramp-up of production in the DMLZ underground mine by mid-2019 and to reach full production rates of 80,000 metric tons per day in 2022. Estimates of timing of future production continue to be reviewed and may be modified as additional information becomes available. Production at the DMLZ underground mine is expected to continue through 2041.

    To mitigate the impact of these events, PT-FI implemented a revised mine sequence; upgraded support systems, blasting and reentry protocols; and improved mine monitoring and analysis processes. Development activities and mining are taking place in unaffected areas while impacted areas are being assessed, rehabilitated and prepared to be placed back into use. Targeted production rates once the DMLZ underground mine reaches full capacity are expected to approximate 80,000 metric tons of ore per day in 2021. Production at the DMLZ underground mine is expected to continue through 2041.

    Big Gossan underground mine. The Big Gossan underground mine was on care-and-maintenance status during most of 2017 and production restarted in fourth-quarter 2017. The Big Gossan mine lies underground and adjacent to the current mill site. It is a tabular, near vertical ore body. The mine utilizes a blasthole stoping method with delayed paste backfill. Stopes of varying sizes are mined and the ore dropped down passes to a truck haulage level. Trucks are chute loaded and transport the ore to a jaw crusher. The crushed ore is then hoisted vertically via a two-skip production shaft to a level where it is loaded onto a conveyor belt. The belt carries the ore to one of the main underground conveyors where the ore is transferred and conveyed to the surface stockpiles for processing.

    Description of Ore Bodies

    Our Indonesia ore bodies are located within and around two main igneous intrusions, the Grasberg monzodiorite and the Ertsberg diorite. The host rocks of these ore bodies include both carbonate and clastic rocks that form the ridge crests and upper flanks of the Sudirman Range, and the igneous rocks of monzonitic to dioritic composition that intrude them. 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.

    Ownership

    48.8% of PT-FI owned by Freeport-McMoRan Inc.; 51.2% of PT-FI owned by PT Indonesia Asahan Aluminum (Persero) (PT Inalum), a state-owned enterprise that is wholly owned by the Indonesian government.

    Note: FCX's economic interest in PT-FI is expected to approximate 81.28% through 2022.

    ADDITIONAL INFORMATION

    Freeport-McMoRan Announces Successful Completion of Transaction with the Government of Indonesia, Marking the Beginning of a New Partnership

    PT Freeport Indonesia Mountain Climbing Policy

    Grasberg District Ore Bodies Schematic

    VIDEO

    360 Virtual Tour of the Grasberg Block Cave Underground Mine

    Grasberg Block Cave Mine Automated Rail System

    PT Freeport Indonesia Underground Mine Complex Development

    Grasberg Operations Highlights

    Grasberg Block Cave Mining

     

     

    2700

INDONESIA

Through its subsidiary, PT-FI, FCX mines one of the world’s largest copper and gold deposits in the Grasberg minerals district in Papua, Indonesia. In addition to copper and gold, PT-FI produces silver. FCX has a 48.76 percent interest in PT-FI and manages its mining operations. PT-FI’s results are consolidated in FCX’s financial statements.

During fourth-quarter 2019, PT-FI completed mining the final phase of the Grasberg open pit and continues to achieve important milestones in ramping-up production of large-scale quantities of copper and gold from its significant underground ore bodies. Results to date from its underground mines are positive and in line with long-term plans to reach full production rates. In aggregate from 1990 through 2019, the Grasberg minerals district produced 33 billion pounds of copper and 53 million ounces of gold, including over 27 billion pounds of copper and 46 million ounces of gold from the Grasberg open pit.

Grasberg Block Cave Mine Automated Rail System05:12

Grasberg Block Cave Mine Automated Rail System

Your browser does not support the video element.
Grasberg Block Cave Mine Automated Rail System
PT Freeport Indonesia Underground Mine Complex Development20:12

PT Freeport Indonesia Underground Mine Complex Development

ENGLISH | BAHASA INDONESIA
Your browser does not support the video element.
PT Freeport Indonesia Underground Mine Complex Development
Grasberg Operations Highlights09:52

Grasberg Operations Highlights

Your browser does not support the video element.
Grasberg Operations Highlights
Grasberg Block Cave Mining02:26

Grasberg Block Cave Mining

Your browser does not support the video element.
Grasberg Block Cave Mining
The Kamoro39:07

The Kamoro

ENGLISH | BAHASA INDONESIA
Your browser does not support the video element.
The Kamoro
Your browser does not support the video element.
The Kamoro - Bahasa Indonesia
more-videos.png MORE VIDEOS
  • Twitter
  • LinkedIn
  • FaceBook
  • Instagram

Footer Menu Two

  • SITEMAP
  • CONTACT
  • SUPPLIERS
  • TERMS OF USE
  • PRIVACY POLICY
  • CAUTIONARY STATEMENT
footer logo

© 2021 Freeport-McMoRan