Man, there's so much shitty about this situation. Foreign billionaire trying to influence politics is bad enough. Circumventing/ignoring engagement with the local community also super shitty, and just asking for trouble from a mine operator's perspective.
I find mining very interesting, especially the reclamation aspect. There are tons of issues to get things back to chemically and physically stable.
The mine shown here is the Ekati Mine in NWT Canada. It's set to close in 2029. All mines must have a plan for closure, and these plans, at least in NWT are public.
Closure plans are super long: the summary text is often 200 to 300 pages, and with the associated appendices are like 1-3k pages in length and are highly technical
Fortunately, Section 1 (page 49) has a plain language summary of the closure plan. Here you can find a summary of major closure strategies for things like pits and waste rock dumps
These plans get more and more certain as they revise them and approach the end of operations.
Fill your boots! There is some cool stuff in the closure plan if you're inclined to learn more!
NSFW COMIC https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQhrLJwFbge2WV9t8RrnMjGrJZdXSYtzQ8k4w&s=