σιδηρουργεῖον
From LSJ
ἐξ ὀνύχων λέοντα τεκμαίρεσθαι → judge by the claws, judge by a slight but characteristic mark, small traits give the clue to the character of a person, deduce something from a small indication, identify a lion from its claws
English (LSJ)
τό,
A iron-mine, Str.4.2.2, 5.1.8, 17.2.2.
German (Pape)
[Seite 880] τό, Eisengrube, Eisenschmiede, Strab. 4, 2, 2 u. sonst.