Focus on the drill, pawn

[TimF101]

Does anyone know whether manning the deep drill falls under any specific work category?  My pawns drill ten seconds or less before they get bored and go find some other task.  I can't figure out which job type to prioritize so that I don't have to constantly micromanage it. 

***Updated***

OK, it's mining.  It looks like pawns are meant to get bored drilling relatively fast.  The way to keep them drilling for as much as possible is to cancel other mining tasks.  In that case they will rotate drill time and generally taking care of themselves.