How Is Gilsonite Mined?
How Is Gilsonite Mined? Mining initially consisted of surface trenching, but all recent work has been underground mining through large-diameter shafts drilled along the veins. Miners use air-powered chipping hammers to carefully break the gilsonite while avoiding contaminating the ore with broken wall rock. Is gilsonite worth anything? Gilsonite production in 2012 is valued at