The Collaborative International Dictionary of English v.0.48:
Mine \Mine\, n. [F., fr. LL. mina. See Mine, v. i.]
1. A subterranean cavity or passage; especially:
(a) A pit or excavation in the earth, from which metallic
ores, precious stones, coal, or other mineral
substances are taken by digging; -- distinguished from
the pits from which stones for architectural purposes
are taken, and which are called quarries.
(b) (Mil.) A cavity or tunnel made under a fortification
or other work, for the purpose of blowing up the
superstructure with some explosive agent.
2. Any place where ore, metals, or precious stones are got by
digging or washing the soil; as, a placer mine.
3. (Fig.): A rich source of wealth or other good. --Shak.
4. (Mil.) An explosive device placed concealed in a location,
on land or at sea, where an enemy vehicle or enemy
personnel may pass through, having a triggering mechanism
which detects people or vehicles, and which will explode
and kill or maim personnel or destroy or damage vehicles.
A mine placed at sea (formerly called a torpedo, see
(a) ) is also called an marine mine and underwater mine
and sometimes called a floating mine, even though it
may be anchored to the floor of the sea and not
actually float freely. A mine placed on land (formerly
called a torpedo, see torpedo), usually buried,
is called a land mine.
Mine dial, a form of magnetic compass used by miners.
Mine pig, pig iron made wholly from ore; in distinction
from cinder pig, which is made from ore mixed with forge
or mill cinder.
(a) a mine where gold is obtained.
(b) (Fig.) a rich source of wealth or other good; same as
Mine 3. --Raymond.