Fighters get items that give them +% to find items or get more gold. Artisans have kits which increase the chance for Rare items crafted. And miners, tanners and stonecutters get... Screwed?
I propose making jewels that improve the chances for finding wood and ore. "Miner's ring", for instance. It may also make sense making something for tanners and stonecutters... Maybe items that give a chance for two processed material instead of one.