A pickaxe
Two workmen using pickaxes
A pickaxe was a tool with a curved head and sharp ends used to break rock.
A pickaxe was among the tools Rooney had in her case when identifying a transwarp coil in the Arctic Circle. (ENT: "Regeneration")
In 2153, Commander Trip Tucker used a pickaxe to cut of some rocks of trellium ore from one of the asteroids. (ENT: "Impulse")
In 2370, Data dreamt that he saw three workmen using pickaxes to break through a warp plasma conduit. (TNG: "Phantasms")