More science (or engineering) in your fiction:
Hard Rock Miner's Handbook
This free pdf file is a compilation of articles on the real-world mining industry. Each chapter begins with a page or two of "rules of thumb" and "tricks/tools of the trade" -- just about the right level of detail for role-playing purposes.
There are some interesting tidbits, as well: dungeon designers may want to look at the sections on natural ventilation (p. 165) and drainage tunnels (p. 193). The section entitled "Source of Slimes" (p. 190), sadly, concerns particles suspended in drainage water, rather than gelatinous life forms.