Omine coalfield - Ominetanden

Japanese: 大嶺炭田 - おおみねたんでん

A coalfield stretching 8km east to west and 12km north to south across Mine and Toyoura counties in Yamaguchi Prefecture. The coalbed seams are intercalated in the Mine Group of the Triassic Period of the Mesozoic era. The coalbed seams expand and contract rapidly, and there are many areas where igneous rocks intrude. The coal is anthracite, but generally has a high ash content and low calorific value. The reserves are said to be around 45 million tons, and the Mine Coal Mine is currently operating at a modest rate, making it Japan's only anthracite producing area. [Ohashi Shusaku]

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

山口県美祢，豊浦両郡にまたがる東西約8km，南北約12kmの炭田。夾炭層は中生代三畳紀の美祢層群に介在する。炭層は膨縮が激しく，火成岩の貫入している部分も少なくない。炭質は無煙炭に属するが，一般に灰分が多く発熱量も低い。埋蔵量は約4500万tといわれ，現在美祢炭鉱が細々と稼行しており，日本唯一の無煙炭産地である。【大橋脩作】

出典　株式会社平凡社世界大百科事典第２版について　情報

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