Mine

1. A subterranean cavity or passage
2. Any place where ore, metals, or precious stones are got by digging or washing the soil; as, a placer mine.
3. (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 torpedo{2} (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{3}), usually buried, is called a land mine.
1. 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.
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.
gold mine
1. a mine where gold is obtained.