This is a 'common sense' thing that given our own media and a couple not-too-corrupt politicians would have a ton of legs.
Like i've met people up by the boundary waters who are pretty conservative and feel they need more mining industry to keep their remaining hospitals and schools open, but also like nature to survive and the tourist economy it brings, who propose themselves that hundreds of millions of dollars be put in escrow for immediate cleanup of a tailings pond spill.