Coal-bearing land - Gantanchi

Japanese: 含炭地 - がんたんち
Coal-bearing land - Gantanchi

The term "coal-bearing area" refers to areas that have little value as a working target because they have small coalfields or coal seams but the distribution and properties of the coal are unknown.
[Type and size]
Coalfields vary in size depending on the conditions of their formation and the influence of crustal movements, and can be classified in various ways depending on the perspective.

*Some of the terminology used to refer to "coal-bearing land" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…それらの地域を地質学的にみると多くは盆状構造をなし,その構造を示す大炭田を炭田盆地ということがある。日本では,炭田の小規模なものや炭層は存在するがその分布や性状が未詳で稼行対象としては価値の少ない地域を含炭地と呼んでいる。
[種類と規模]
 炭田はその生成条件や地殻変動の影響などによって大小さまざまのものがあり,分類についても見方の相違によっていろいろに分けることができる。…

※「含炭地」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

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