How Cigar Lake Mine Solved the Tunnel Collapse Problem

There's about 99,000 tons of uranium once you concentrate it. It's enough to power 300 terawatt hours of electricity production from modern reactors. The pressure there is high such that when they gathered up the material out, either to make the tunnel or to start mining the uranium, they couldn't keep the tunnel from collapsing. They had to invent a new approach just for that hyper concentrated pocket of ore.