Exploration on coal deposit have been done within the bukit asam mining concession (P.N. tambang batu bara bukit asam) in Tanjung enim, south-sumatera. the areas of areas of klawas-antticline, A. Endikat and A. muara tiga- A. penjabungan - A. Suban Complex Have Been troughly investigated.
Daerah panasbumi bobo terletak di dalam wilayah kecamatan Bajawa, Kabupaten Daerah TK.II Ngada Flores, Nusa Tenggara Timur. Secara geografis terletak diantara koordinat UTM 276058-282264 meter utara dan 9019890-9024730 meter timur
By decree of the Director of public Works of February 18, 1918 No. 645/Dir. The present Writer Was instructed to carry out the Borneo, that after his arrival at Kota Baroe, started in April 1918 At the end of June 1919 the activities were suspended for the time being.
the ombilin coal depostits in the padang highlands (minang kabau) situated near sawahlunto and connected by a 160 km rackrail with padang on the west coast of central sumatra were doscovered in 1868 by de greve and later mapped out by verbeek in 1875