noun
coal mine; colliery
General term for a coal mine as a facility or location.
この地域にはかつて多くの炭鉱があった。
There used to be many coal mines in this area.
炭鉱で働く人々の安全が最優先
The safety of people working in coal mines is the top priority.
noun
coal-mine shaft; coal pit
Only when written 炭坑
Refers specifically to the shaft or pit of a coal mine; written as 炭坑.
古い炭坑の跡が観光名所になっている。
The remains of an old coal-mine shaft have become a tourist attraction.