Overview of the Open-Cast Mine Coal Seam A2 near Tunnel 8. In the background, the compressor house

Overview of coal mining in the open-pit mine (day mine). In the foreground, the exposed coal seam with workers at tipping carts. In the background, a dammed lake on the left and factory buildings on the right. Part of the loose-leaf photo album presented by the staff of the Boekit-Asam Coal Mines in Sumatra to the retiring Engineer-Director H. Tromp on January 7, 1922.