Ronaldo Irzon,
Center for Geological Survey, Geological Agency, Ministry of Energy and Mineral Resources. Jln. Diponegoro No.57 Bandung, Jawa Barat,
Indonesia
Ildrem Syafri,
Faculty of Geology, Padjadjaran University,
Indonesia
Johannes Hutabarat,
Faculty of Geology, Padjadjaran University,
Indonesia
Purnama Sendjaja,
Center for Geological Survey, Geological Agency, Ministry of Energy and Mineral Resources,
Indonesia