SOURCE AND DISTRIBUTION OF ARSENIC SURROUNDING A SMALL SCALE GOLD MINE, SELOGIRI AREA, WONOGIRI, INDONESIA
PROCEEDINGS JOINT CONVENTION BALI 2007
The 32nd HAGI, The 36th IAGI, and The 29th IATMI Annual Conference and Exhibition
SOURCE AND DISTRIBUTION OF ARSENIC SURROUNDING A SMALL
SCALE GOLD MINE, SELOGIRI AREA, WONOGIRI, INDONESIA
Rodhie SAPUTRA1, I Wayan WARMADA1, Agung HARIJOKO1,
Yoshinobu MOTOMURA2, Akira IMAI3, Koichiro WATANABE3
1 Geological Engineering Department, Faculty of Engineering, Gadjah Mada University, Indonesia
2 Department of Earth and Planetary Science, Kyushu University, Japan
3 Earth Resources Engineering Department, Faculty of Engineering, Kyushu University, Japan
ABSTRACT
Selogiri area has been known as small scale gold mining, which is already mined for about 15 years. The amalgamation method is used to extract the gold from the ore. Gophering mining method is used for gathered the rock from the mine site, which is known as conventional mining method. Arsenic occurrence during the mining activity shown from the slurry sample, known that there is arsenic concentration in several numbers. That would be very interesting to determine the source of arsenic, as there is no arsenic mineral reported in the ore of the Selogiri mine. The XRD analysis result from concentrated stream sediment samples which are collected from the river surrounding the mine site displayed that the ore minerals content were pyrite, chalcopyrite, magnetite, sphalerite, and galena. The ore microscopy analysis had shown that there is no arsenopyrite or other arsenic mineral in the ore. From both X-Ray Fluorescence qualitative and quantitative measurements were known that the pyrite content a small amount of arsenic. Additionally some assumption related to this result was taken, including how the physical properties from pyrite itself may contribute on the arsenic occurring in the area.
Keywords: Arsenic, pyrite, small scale gold mining, Selogiri
The 32nd HAGI, The 36th IAGI, and The 29th IATMI Annual Conference and Exhibition
SOURCE AND DISTRIBUTION OF ARSENIC SURROUNDING A SMALL
SCALE GOLD MINE, SELOGIRI AREA, WONOGIRI, INDONESIA
Rodhie SAPUTRA1, I Wayan WARMADA1, Agung HARIJOKO1,
Yoshinobu MOTOMURA2, Akira IMAI3, Koichiro WATANABE3
1 Geological Engineering Department, Faculty of Engineering, Gadjah Mada University, Indonesia
2 Department of Earth and Planetary Science, Kyushu University, Japan
3 Earth Resources Engineering Department, Faculty of Engineering, Kyushu University, Japan
ABSTRACT
Selogiri area has been known as small scale gold mining, which is already mined for about 15 years. The amalgamation method is used to extract the gold from the ore. Gophering mining method is used for gathered the rock from the mine site, which is known as conventional mining method. Arsenic occurrence during the mining activity shown from the slurry sample, known that there is arsenic concentration in several numbers. That would be very interesting to determine the source of arsenic, as there is no arsenic mineral reported in the ore of the Selogiri mine. The XRD analysis result from concentrated stream sediment samples which are collected from the river surrounding the mine site displayed that the ore minerals content were pyrite, chalcopyrite, magnetite, sphalerite, and galena. The ore microscopy analysis had shown that there is no arsenopyrite or other arsenic mineral in the ore. From both X-Ray Fluorescence qualitative and quantitative measurements were known that the pyrite content a small amount of arsenic. Additionally some assumption related to this result was taken, including how the physical properties from pyrite itself may contribute on the arsenic occurring in the area.
Keywords: Arsenic, pyrite, small scale gold mining, Selogiri
Labels: Geology
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