[d20] Prospecting and Mining Metals and Gems? | RPGnet .
8/14/2005· terrain / ore / % per square mile of prospecting MOUNTAIN / GOLD / 4% ALLUVIAL PLAIN / GOLD / 2% HILL / GOLD / 1% PLAIN / GOLD / % SHORELINE / GOLD / %... and so on. This allows ME to know if ore is present, not the characters. Once I know ore is present, I can come up with rules for them to discover it, as well as mine it.