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KELIAN GOLD MINE KALIMANTAN INDONESIA

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					                                                   KELIAN GOLD MINE – KALIMANTAN INDONESIA




KELIAN GOLD MINE
KALIMANTAN INDONESIA

The Kelian open pit gold mine is located in   brecciated     carbonaceous     sediments,
the foothills of the Central Kalimantan       volcaniclastic sediments, diatreme breccia
mountains about 3km south of the              and intrusive rhyolite (Figure 1). Detailed
equator. Kelian is a disseminated, low        engineering geological models were
sulphidation, epithermal gold deposit and     formulated from a comprehensive field
is one of a number of volcanic hosted gold    and laboratory investigation. These
deposits in Central Kalimantan.               models formed the basis for state-of-
                                              practice probabilistic slope stability
PSM staff have been involved with this        analyses, carried out for combined rock
project since the feasibility studies in      mass and structurally controlled failure
1989. From the commencement of mining         mechanisms.
in late 1991 a program of geotechnical
mapping, drilling and laboratory testing      During all stages of mining PSM has
was undertaken culminating in analysis        provided review services for the site
and slope design studies completed in         based Pit Slope Management Program.
1995 for the ultimate pit.                    Recent studies by PSM have included a
                                              Quantitative Risk Assessment of the long
This work included a specific study of the    term slope stability of the final pit void for
north wall which is formed in a complex       mine closure purposes.
geological setting comprising faulted and




Figure 1   North wall of the Kelian open pit in March 2003, one month before completion of
           mining.



                                        1                                      6 December 2003
                                                       KELIAN GOLD MINE – KALIMANTAN INDONESIA




After nearly 12 years of mining the open         The pit has produced about 92 million
pit was successfully completed in April          tonnes of ore which yielded more than 176
2003 (Figure 2). Mining started at an            tonnes of recovered gold. Around 219
original elevation of 1280mRL (280m              million tonnes of waste rock has been
above sea level) in late 1991 and finished       mined. Kelian is the largest and deepest
at 780mRL (220m below sea level).                open pit to formally close in Indonesia to
                                                 date.
The pit floor is some 320m below the
Kelian River which runs adjacent to the
open    pit.  The   pit   perimeter   is
approximately 1200m in diameter.




Figure 2   Kelian open pit in October 2003 about six months after completion of mining. .




                                          2                                        6 December 2003

				
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