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| Hard rock mining ： ウィキペディア英語版 |
Underground mining (hard rock)
Underground hard rock mining refers to various underground mining techniques used to excavate ''hard'' minerals, mainly those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of gems such as diamonds. In contrast soft rock mining refers to excavation of softer minerals such as salt, coal, or oil sands.
==Mine access==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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