1) A condition for buying and selling a mine is that the original owner or owners should have acquired the land lawfully and started mining on that land. Once this condition is found then the mine can be sold and resold to different buyers. Such a deal will be regarded as a normal sale in Shari’ah, and the rules of a normal sale will apply. This is permissible and the earnings of that mine will be Halaal.
And Allah knows best
