Profession (Miner):
This skill gives you the knowledge of digging holes in the ground, shoring up tunnel shafts, and other related subjects.
Digging holes: For this skill check, you can use either INT or STR as a modifier. Each point you surpass the DC reduces the time by 1 hour.
DC 10, excavate 5' cube of dirt in 20 hours
+2 DC for difficult soil or sandstone
+4 DC for Stone or root entangled soil
+6 DC for Granite or Kalichi (a hard clay layer such as found in the Arizona deserts)
+4 DC for improvised implements (Swords, Military Picks, etc..)
And in keeping with Sean Reynolds’s recent rant on avoiding absolutes, +5 DC for untrained use.
Characters with Stone-Cunning get a +4 to their check.