Can't Find A Mine, Looked For Hours

[Butko]

I think it needs to destroy all built mines once a 3-4month... so every mine used will be built again, and unused ones will be taken by noobs

Quite good idea, but instead of that mine should collapse itself if not used for certain amount of time (let's say 1 week - 1 month IRL time? But there often remains problem of claims over mine or spot, so spot should change location as well.