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Sub-surface mining is called hard rock mining if the mining is for hard minerals such as precious metals, and soft rock mining if it is for soft minerals such as coal. Underground mines are also categorized by the direction of entry underground. A drift mine enters the earth horizontally, a slope mine enters the earth at a downward slope, and a shaft mine uses a vertical or steeply inclined downward shaft to enter the mine.
Sub-surface mining is called hard rock mining if the mining is for hard minerals such as precious metals, and soft rock mining if it is for soft minerals such as coal. Underground mines are also categorized by the direction of entry underground. A drift mine enters the earth horizontally, a slope mine enters the earth at a downward slope, and a shaft mine uses a vertical or steeply inclined downward shaft to enter the mine.
For specific types of mining and minerals mined, see:
* [[coal mining]]
:* [[strip mining]]
:* [[longwall mining]]
:* [[room-and-pillar mining]]
* [[placer mining]]
* [[hard rock mining]]
==Safety==
==Safety==