Me and a few other fellow players feel as though there should be a world dedicated to mass mining etc. if you want to dig up a crap tonn of cobblestone, doing it in the overworld would take away landscape for new players to join etc. and if your mining, you could accidentally mine underneath someones unclaimed base without realising. The mining dimention could be a world thats reset once a month like the end and nether, just a place for people to go ham and collect bulk resources.
i hope this idea gets read and you guys take it into concideration as im not the only player that has thought this would be a really good idea.