(idiomatic) I don't know; I have no idea.

plural of open-pit mine

plural of canary in a coal mine

A commune in Pas-de-Calais department, Hauts-de-France, France.

Andrena helvola, a species of mining bee.

A person who works in a mine. / An operator of ordnance mines and similar explosives. / Any bird of one of four species of Australian endemic honeyeaters in the genus Manorina.

The subdiscipline of soil science that studies the solid inorganic phases controlling physicochemical processes in soils and sediments.

(geology) Any naturally occurring inorganic material that has a (more or less) definite chemical composition and characteristic physical properties.

of, related to, or containing minerals

(Roman mythology) The goddess of wisdom, especially strategic warfare, and the arts, especially crafts and in particular weaving. She is the Roman counterpart of Athena.