Here in the UK I know of lots of old mines and quarries that, because the ground is inherently unstable once the mining has finished, the land gets reclaimed as a nature reserve. Think nice walks, wildflowers, native trees, marshlands etc. A lot of effort goes into making habitats for insects, birds and animals.
Whether or not it is all paid for by the mining companies, I don't know.
God bless you, KenM