I was curious to see if anyone had tried the coal mine bit. This is the closest I could find, a business plan to sell coal attached to carbon credits. Not sure what’s happened since 2016.
Greenpeace had claimed that they tried to offer Vattenfall to buy their coal mines in Eastern Germany to shut them down (they were later sold to czeck company EPH), but it's a bit unclear how serious that offer was:
https://www.fr.de/wirtschaft/greenpeace-bietet-kohle-tagebau...
Though maybe that's also a cautionary tale. Back when that happened (2015) the political discussion around coal in Germany was that a coal exit wasn't really part of the discussion and local politicians would say things like coal will be mined until the 2040s. Since then the debate has moved to "Coal exit in 2038", and more recently to "Coal exit very likely in 2030".
What I'm trying to say: Even if you're successful with such a project, it's not exactly clear how much you gain. The political discourse on climate is moving fast (though still not fast enough).
Though maybe that's also a cautionary tale. Back when that happened (2015) the political discussion around coal in Germany was that a coal exit wasn't really part of the discussion and local politicians would say things like coal will be mined until the 2040s. Since then the debate has moved to "Coal exit in 2038", and more recently to "Coal exit very likely in 2030".
What I'm trying to say: Even if you're successful with such a project, it's not exactly clear how much you gain. The political discourse on climate is moving fast (though still not fast enough).