Common well - Kyodosei

…In Japan's mining industry, in addition to the mining and acquisition of minerals by the mining rights holder himself, there has long been a practice of allowing third parties to mine and acquire minerals for a certain amount of money through contracts between the mining rights holder and a third party, known as "kinsakibori contracts," "jijigori contracts," "kyodo" contracts, etc. This contract practice similar to the lease of mining rights was invalid under the old Mining Law (promulgated in 1905) and in court cases, but in reality it has rather increased, and this tendency was particularly noticeable in coal mining areas. …

*Some of the terminology explanations that refer to "kyodo wells" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…日本の鉱業経営においては，鉱業権者自身による鉱物の掘採･取得のほかに，古い時代から，斤先掘（きんさきぼり）契約，自稼掘，共同井などと呼ばれる鉱業権者と第三者との契約により，特定の対価のもとに第三者による鉱物の掘採･取得を認める慣行が行われてきた。このような鉱業権の賃貸借類似の契約慣行は，旧鉱業法(1905公布)上，また判例上も無効とされたが，現実にはむしろ増加していき，とくにその傾向は石炭鉱区で顕著であった。…

※「共同井」について言及している用語解説の一部を掲載しています。

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