Torigatayama mine

Japanese: 鳥形山鉱山 - とりがたやまこうざん

Nittetsu Mining's limestone mine is located in the south of Niyodogawa Town in the northwest of Kochi Prefecture. It is located in a corner of the Shikoku mountain range, and at an altitude of 1,459m, it is the highest open-cut mine in Japan. It consists of limestone, diabase tuff, quartzite, and slate from the Chichibu Paleozoic Formation, and limestone is exposed throughout the entire mining area. It has a grade (calcium oxide) of over 55%, and reserves of approximately 1.5 billion tons. Development began in April 1969, and operations began in May 1971 with a target annual production of 6 million tons. The mine is extracted using the step mining method, and the raw ore is crushed at the mine base and transported to the shipping base at Susaki Port on a long-distance conveyor belt spanning 23km.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

高知県北西部，仁淀川町南部にある日鉄鉱業の石灰石鉱山。四国の脊梁山脈の一角にあり，標高 1459m，日本の露天掘り鉱山のうち最も高い位置にある。秩父古生層の石灰石，輝緑凝灰岩，ケイ岩，粘板岩類からなり，石灰石は鉱区全面に露出している。品位 (酸化カルシウム) 55%以上，埋蔵量約 15億t。 1969年4月開発に着手，1971年5月年産 600万tを目標に操業を開始した。階段採掘法により採掘し，原石は山元で粉砕し，積出基地の須崎港まで 23kmに及ぶ長距離ベルトコンベヤで輸送している。

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