Converts resources into materials or commodities.

Base busy seconds:	400 if mining on lode.	600 if mining on steppe.	1000 if mining on desert.
Danger:	Slight.
Required pieces:	Machine-mining or tool.
Required skill:	Logging.
Required appearance:	Laborer.
Pollution created:	Same number as materials or commodities mined.
Waste created:	Same number as materials or commodities mined.