Fodîna, huius fodínæ, f. g. pen. prod. Plin. A quarrie: a mine: a place where a thing is digged.
Lewis and Short: Latin dictionary
fŏdīna, ae, f. [id.; a place from which a mineral is dug], a pit, mine: argenti, Varr. R. R. 1, 2, 22; Vitr. 7, 7 (also written in one word argentifodina, v. h. v.); Dig. 27, 9, 3 al.; Plin. 33, 6, 31, 98.