China houses some of the world's biggest mining pools. The main cost of bitcoin mining is the electricity. It can constitute up to 70 percent of the overall cost. For this reason, most of these bitcoin mining equipment are installed .
Mining coal in the Living Rock Caverns requires level 77 Mining, while mining gold there requires level 80 Mining. Beware of aggressive, ranged/melee level 92 creatures that protect the rocks. Using world 84 can protect individuals from the rock creatures as there is a high volume of players in this world.