The Ombilin Coal Mine (formerly PT Tambang Batubara Ombilin (TBO)) is a coal mine near Sawahlunto, West Sumatra, IndonesiaIt is located in a narrow valley along the Bukit Barisan mountains, among the Polan, Pari and Mato hills, approximately 70 kilometres (43 mi) northeast of PadangCoal was discovered in the mid-19th century by Willem Hendrik de Greve, and mining was pioneered in the area in ....