Answer: Indonesia
Notes: Indonesia houses the famous "Ombilin Coal Mine". The Ombilin Coal Mine is a coal mine near West Sumatra, Indonesia. It is located in a narrow valley along the Bukit Barisan mountains, among the Polan, Pari and Mato hills. Coal was discovered in the mid-19th century by Willem Hendrik de Greve, and mining was pioneered in the area in 1876. The mine is known as the oldest coal mining site in Southeast Asia.
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