Brief synthesisOmbilin Coal Mining Heritage of Sawahlunto is an outstanding example of a pioneering technological ensemble planned and built by European engineers in their colonies designed to extract strategic coal resources. Criterion (ii): Ombilin Coal Mining Heritage of Sawahlunto exhibits a significant interchange of mining technology between Europe and its colonies during the second half of the 19th century and early 20th century. Criterion (iv): Ombilin Coal Mining Heritage of Sawahlunto is an outstanding example of a technological ensemble designed for maximum efficiency in the extraction of a key, strategic natural resource – in this case industrial grade coal. AuthenticityOmbilin Coal Mining Heritage of Sawahlunto is a technological ensemble consisting of twelve components. In light of the decline in coal mining, Sawahlunto is developing heritage tourism as its main economic activity, and visitor numbers are expected to increase.