Ombilin coal mine

The Ombilin Coal Mine (formerly PT Tambang Batubara Ombilin (TBO)) is a coal mine near Sawahlunto, West Sumatra, Indonesia. It 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 Padang. Coal was discovered in the mid-19th century by Willem Hendrik de Greve, and mining began in the area in 1876. The mine is the oldest coal mining site in Southeast Asia.