try removing and rebuilding the stock pile
also press j and try to figure out if the thing is tasked for something
Neither solution seems to have worked. The pick was in a bin, but removing it from the bin and moving it back to a newly designated weapon stockpile with 0 max bins has not made anyone pick it up. It's not being used for anything. There are at least 4 dwarves (all non-military) standing around in my meeting area doing the "no job" occupation, who could all be mining out some bedrooms instead...
I guess I'll see if the traders bring me some normal picks or if I can smelt some
Update: I forged some copper and iron picks the old fashioned way (that is, no magma involved), and the dwarves are not going for those either... Color me confused.
Update update: My carpenter that is also in the military went and picked up an iron pick even though he does not have mining enabled and there are far more suitable weapons lying around (like axes and swords)... What the shit? This carpenter has been giving me trouble for a while now, earlier he was constantly picking up a (cave spider silk sock) and a (giant cave spider silk shoe), walk away 1 tile, turn around, drop the items again, repeat ad infinitum.
Now I've dumped the iron pick he's carrying, specifically told him to equip an iron axe, and stationed him somewhere to make him a recruit instead of a carpenter. And while the military screen says that the carpenter has the iron axe claimed or equipped or whatever, the axe is nowhere to be seen in his inventory...
Update update update: luckily I got a high master miner migrant, so I do have 2 miners now, but the issue with the picks remains unsolved...