The Ombilin Basin is a Tertiary intermontane basin, located within the Barisan Mountain Range of West Sumatera. Despite its relatively small Tertiary basin covering approximately 1500 sq km within the Padang Highland, the Ombilin Basin contain sequence of Tertiary sediment up to 15,000 ft thick. The basin is well known for coal mining carried out since 1891 in Sawahlunto area. Based on ARI/ s…