Item Restricted to University of Alberta Users
Log In with CCID to View Item- 90 views
- 1 download
Overview of the Acid Rock Drainage and Overburden Management Program at PT Freeport Indonesia Operations in Papua Province, Indonesia
-
- Author(s) / Creator(s)
-
The Grasberg Mine is a copper and gold open pit mine operated by PT Freeport Indonesia (PTFI) and located in the high equatorial mountains of the Indonesian province of Papua. The climate is alpine/subalpine with little seasonal variation in temperature or rainfall. The daily average temperature ranges from about 2°C to 14°C and the annual rainfall in the vicinity of the mine and overburden stockpiles is about 4000 mm to 5000 mm. Mining of the Grasberg open pit will continue until 2014 at which time approximately 2750 Mt of overburden will have been produced. Current overburden production rates are 200 Mt per annum. The current mill rate is 230 000 t/day from the Grasberg pit (190 000 t/day) and the underground operations (40 000 t/day). The acid rock drainage (ARD) issues associated with overburden from the Grasberg operations were identified early in the mining operation. Almost all overburden placed to date has been Potentially Acid Forming (PAF). Laboratory testing has identified four main overburden types: limestone and non-acid forming (Green waste), PAF low capacity (Blue waste) and PAF high capacity (Red waste), and Heavy Sulfide Zone (HSZ), which contains greater than 20 per cent pyrite. Waste type block modelling indicates that at least 30 per cent of the overburden production from 2003 to the end of Grasberg pit operations will be limestone. Strategies are being developed to maximise the beneficial use of limestone through strategic blending and placement for ARD mitigation and control.
-
- Date created
- 2003-01-01
-
- Type of Item
- Article (Published)
-
- License
- Use of this product is restricted to current faculty, staff, and students of the University. It is the responsibility of each user to ensure that he or she uses this product for individual, non-commercial educational or research purposes only, and does not systematically download or retain substantial portions of information. Users may not reproduce or redistribute unprocessed/raw data portions of the data to any third party, or otherwise engage in the systematic retransmission or commercialization of the data.