Re: waste rock. Usually waste rock is placed in piles. During operations, they have a series of collection ditches to manage contact water and pump it to the tailings pond or an exhausted pit, until an impermeable cover and growth media are placed over top. The cover prevents aeration, which causes the ML/ARD issues I mentioned in the other post. 211 km of waste rock is a lot of additional cost and env risk, and work to offset that risk. I’m not saying we shouldn’t do this, but I’m saying it isn’t likely unless they are mandated to do it and have a well developed plan to do so (more time delays and cost)

They are doing underground hauling of waste rock at one mine I know about, but it’s because the mine is already underground and they have the route established, and the mine itself is expanding.

There is so much to consider in mining if you want to do it the right way