mine dial

Webster's Dictionary (GCIDE)

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. [1913 Webster]

2.Any place where ore, metals, or precious stones are got by digging or washing the soil; as, a placer mine. [1913 Webster]

3.(Fig.): A rich source of wealth or other good. --Shak. [1913 Webster]

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 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. [PJC]

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 (a) a mine where gold is obtained. (b) (Fig.) a rich source of wealth or other good; same as Mine 3. --Raymond. [1913 Webster]