Mandrills!
No, not the animal--the tool!
Hereby requesting that mandrills be put into JADE.
For those who don't know, a mandrill (besides being an animal) is a one-handed pick that is smaller than a pickaxe. It is used primarily in enclosed spaces, where there wouldn't be room for swinging a pickaxe.
Game-wise, a mandrill should probably do about as much damage as a pickaxe does now (maybe 1d5+2 piercing, for a medium-sized one?), and be one-half to one-forth as effective as a pickaxe for mining purposes (again modified by the size).