σιδηρεῖα
From LSJ
πολλὰ τὰ δεινὰ κοὐδὲν ἀνθρώπου δεινότερον πέλει → many things are formidable, and none more formidable than man | wonders are many, and none is more wonderful than man | many things are bad, but nothing is more atrocious than man
English (LSJ)
τά,
A ironmines, Arist.Pol.1259a25, Thphr.HP5.9.2, Lap.52, Str. 1.2.39: sg. -εῖον, τό, IG11(2).161 A 19 (Delos, iii B.C.).