Takashima Coal Mine

Takashima coal mine (Takashima Tankō) was a coal mine in Japan, located on the island of Takashima off the northern shore of the Nagasaki Peninsula. It was known as the town of Takashima but is now part of the city of Nagasaki, Nagasaki Prefecture. The entire 1.23 square kilometre island, including the areas under the ocean off the coast of the island, was a coal mine. There were 22 mining shafts covering 12,480 hectares. 80% of the coal produced was considered high-quality coking coal, which was consumed in Kyushu and Osaka for gas and coke. The mine was closed on November 27, 1986. It was designated a National Historic Site in 2014. Along with the Hashima Coal Mine, it was registered as one of the assets of the UNESCO Sites of Japan's Meiji Industrial Revolution: Iron and Steel, Shipbuilding and Coal Mining World Heritage Site in 2015.

Mine data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).