The Crandor and Karamja mine also known as Karamja Volcano mine is located in the Crandor and Karamja dungeon. It can be accessed from the volcano on Karamja. Its main use is the quest Dragon Slayer. Elvarg the dragon lives in the tunnels, and so an anti-dragon shield is necessary for those wishing to go into the cavern off of the main cave.
These gold rocks are far from any nearby bank, so training on them is not a viable training option. The dungeon is dangerous to low combat levels as well, so mining here is not the best idea.