saturn_656 saturn_656:
I'm thinking beyond crushing into milling (where the bulk of the "nasty stuff" comes into play), you're not going to get around having to crush the rock and all the issues that comes with that. With the old roasters Mercury and Arsenic contamination were facts of life.
True enough.
Teck has a problem with selenium right now--a metalloid similar to arsenic. They operate, I think, five coal mines near the Elk River in southeast BC. Run-off from the mines has raised selenium levels in the Elk River. The Elk River flows into Montana, so Montana is quite alarmed right now. The problem is that selenium is a bugger to treat and there is basically no proven technology in place that can be shown to be abe to deal with the levels in the Elk River right now.
Teck plans to expand all five mines. Theya re undertaking what they call one o the alrgest water management plans in the world in order to try to deal with the selenium issue.
CBC: Mines blamed for high selenium levels in B.C.'s Elk RiverPoor Teck, of course, is still smarting from having being found liable in the US for slag deposited in Roosevelt Lake, Washington State from their smelter in Trail (unfrom 1930 to 1995).
Anyways, all that to say that mines can still present profound local and regional environmental challenges. Miners, in my experience, are not evil and are not out to screw the environment. But once the cat's out of the bag and the problems are evident, they tend to be very difficult to fix. Sometimes, to my mind, you you need some strong regulation to get the company to spend a few more million up front to reduce risk down the road. (not that it would have helped with selenium--nobody saw that coming).