Lewis & Short

mĭnĭārĭus, a, um, adj. [minium],

  1. I. of or belonging to minium or cinnabar (post-Aug.): miniarium metallum, a cinnabar mine, Plin. 33, 7, 40, § 118.
  2. II. Subst.: mĭnĭā-rĭa, ae, f., or mĭnĭārĭum, ii, n., a cinnabar mine, Plin. 33, 7, 40, § 121.