kuliah 4 - endapan porfiri
DESCRIPTION
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ENDAPAN TIPE PORFIRIENDAPAN TIPE PORFIRI
Hedenquist et al., 1996
PTFI END 2011 RESERVESPTFI END 2011 RESERVES
55
GRASBERG GEOLOGY – PRE MINING
HISTORYHISTORY ERTSBERG ERA:ERTSBERG ERA:
– 1934: Ertsberg discovered – Jean Jacques 1934: Ertsberg discovered – Jean Jacques DozyDozy
– 1960: Forbes Wilson expedition, explores 1960: Forbes Wilson expedition, explores ErtsbergErtsberg
– 1967: COW I signed1967: COW I signed– 1973: Production began on Ertsberg skarn1973: Production began on Ertsberg skarn
GRASBERG ERA:GRASBERG ERA:– 1988: Grasberg discovered (Dave Potter)1988: Grasberg discovered (Dave Potter)
Big investment: high risksBig investment: high risks Need guarantee for long term Need guarantee for long term
investmentinvestment– 1991: COW II signed1991: COW II signed
The new COW with a 30-year term and The new COW with a 30-year term and two 10-years extensions is signedtwo 10-years extensions is signed
COW II is more beneficial to Indonesia.COW II is more beneficial to Indonesia.
Dozyand his team
Forbes Wilsonand Delos Flint
Grasberg Pre-mining
GrasbergOpen-pit
Ertsberg Original Outcrop Grasberg
Ertsberg
Early Original Photos
Ertsberg