A mine where ore or minerals are extracted (an underground mine or open-pit mine).
昔、この山には大きな鉱山があった。
There used to be a large mine on this mountain.
鉱山で働くには専門の訓練が必要だ。
Working in a mine requires specialized training.
その鉱山は資源が枯渇して閉山した。
The mine closed after its resources were exhausted.