(military) A mine that is placed on land and designed to explode when stepped upon or touched.

(databases) A technique for searching large-scale databases for patterns; used mainly to find previously unknown correlations between variables that may be commercially useful.

(military) An explosive device placed in the water and intended to destroy or deter vessels.

Any mine used for the extraction of salt. / (by extension) Any laborious work situation, especially in a confined space.

A mine for gold ore or metal. / (idiomatic) A very profitable economic venture. / (idiomatic) A plentiful stockpile of something sought after.

(military) A mine which responds to the magnetic field of a target.

(US, Mafia, slang) A personal friend of the speaker/writer who is not a member of the Mafia.

Any of very many species of bee, of the genus Andrena, that nest in burrows

The branch of engineering that is applied to mining.

An excavation filled with gunpowder for blasting rocks, etc.