1Department of Earth Resources Engineering;
Faculty of Engineering;
Kyushu University;
Fukuoka;
Japan 2Department of Geology Engineering;
Mining Engineering Study Program;
Hasanuddin University;
Makassar;
Indonesia;
Department of Earth Resources Engineering;
Faculty of Engineering;
Kyushu University;
Fukuoka;
Japan;
Department of Mining Engineering;
Faculty of Mining and Petroleum Engineering;
Bandung;
Indonesia;