Large operations like this, especially those close to coast, generally have to set aside a certain percentage for rehab down the line. Normally part of mining/e

Large operations like this, especially those close to coast, generally have to set aside a certain percentage for rehab down the line. Normally part of mining/enviro approvals. The plan needs to be updated every 3-4 years, with updated estimates etc. Greenbushes is miles away from having to worry about that. I’ve been tangentially involved in the mine designs for the new underground mine coming off the pit, so it’s decades away from rehab. A few options for old pits I’ve worked on is backfilling with waste material and then capping with earth. Backfilling with treated Tailings and then capping. Or just letting it flood, but putting protections in. Generally they will be liable to manage if for a decade or so after mining is complete. Again all depends on the permit. Biggest thing you worry about though, especially if you go underground is how to seal it off from other water structures (if required.) Sorry for brain dump but lots of variables here! (I’m a hard rock mining engineer)