minas

to mine (to extract ore from the ground)
(transitive) to mine (to place mines (device that explodes when touched or approached) in)
to undermine (to dig under something)
(figuratively) to undermine (to weaken or work against)

ορυχείο

μεταλλείο

νάρκη

ορυχείο/μεταλλείο/νάρκη

Practice speaking and memorizing "minas" and many other words and sentences in Portuguese.