I'm against mining but love the products i use everyday that make my life as easy as pie.
so the sulfide is only released when?
seems to me this is a natural occuring mineral and is under the waterways as well....it is in the ground already, but i'm sure some fair minded "environmentalists" will enlighten us with the all the scary dangers, so i don't have to worry.
Though I am NOT an environmentalist...I can answer your question on this one.
The ore is currently and mostly unexposed to air/moisture in it's native state; it is buried in rock formations where it has been for a few million years. Once the rock is exposed by mining it, moisture and air will contact the rock and cause it to sulfate, which creates sulfuric acid. This then leaches out by natural actions (water seeks a route through cracks now made in the rocks, eh?) and then finds it's way to ground water which gets into the streams acidifying it far worse (ten thousand times) than acid rain, and of course runs down hill toward the biggest cleanest lake in the world.
It is very conceivable that someday the world will need this clean water just to drink. We may bottle/pipe it out west, or tanker it to other parts of the world that does NOT have fresh water that is potable. Water is also a mineral and a resource and imagine how rich the great lakes region would become if we sold it like crude oil is sold today?
Of course I wouldn't worry about it for yourself....you will be dead and gone and who gives a rip if your grand kids are stuck with the bill to clean it up or try and contain it, or that the water in the lake isn't very salvageable for drinking?
Much like the lumber baron's who took the pines never mind the consequences if it means a few thousand jobs and short term profits and taxes....the environment is expendable and why worry about that? Funny thing about trees though...they grow back over a dozen centuries. What about rock that is exposed to air and water, and where the mining site is minutes from the big lake and the company that created the mine is no longer around...a corporation which comes and goes by filing a few papers at the state and county level?
Not too long ago, the Keweenaw had a proposed pulp factory all set to go that would have used local wood cutting to produce pulp and would have required use and discharge of water into the big lake too. But enough people said nuts to that factory even though it was going to provide jobs and tax revenue far greater than this Kennecott mine and killed it.
Different times and different economic conditions produce different outcomes.
I hope I am dead wrong, and that this company will act responsibly and find the technology to close this thing up so that the waters leading from the site and surroundings won't be an environmental disaster after all, and that the company will be good stewards of this pristine area and will someday be put it back to it's natural state- unmolested.
I doubt I will live to see it, but hope springs eternally.