The two stereotypes that I've seen the most about Dwarves are that they live in mountains and mine for precious metals and the like. Recently, I've been thinking of an interesting place to take that.
At the moment, I've had some dwarves (mostly miners and smiths) live and work in and around this large mountain. This mountain contains veins of silver, and a spring that feeds into a river. Downstream from this river is where most of the farmers and merchants for this kingdom live.
My question is, is it possible for the runoff from this mountain mine to cause cases of argyria in the people that live in the village downstream?