definition
strict definition
underground mine
A cavity or network of tunnels dug under the earth for extraction of minerals.
An underground mine is an intentionally hollowed cavity, tunnel, or network of tunnels under the surface of the earth where minerals or other substances are dug out from within.
The excavation removes substances from beneath the surface. It can be one cavity or a connected network of tunnels.
An open pit is fully exposed to the atmosphere above. The underground mine instead extends into enclosed space beneath the earth's surface.
Related definitions
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landfill
An area whose shape is formed by accumulated refuse, whether deposited in an excavation or above existing ground. -
open pit
An excavated hole in the earth bounded on all sides and fully open to the atmosphere. -
trench
A waterless excavated channel below mean surrounding surface level, bounded by retained earth on both sides. -
well
A shaft drilled, bored, or dug into the earth to extract water, oil, natural gas, or similar substances.