Fact
A reworked Deadmines drop, the Rockslicer axe, lets any player (regardless of profession) mine Copper/Tin/Silver/Iron nodes for 30 uses before the effect wears off; it is Bind on Pickup but can be re-farmed by repeating the dungeon. This is described by players/press as a rule-breaking discovery, not an intentionally advertised system.
Confidence note
Confirmed (2 independent outlets: Wowhead News and PC Gamer)