Go back to durotar. Circle from Razor Hill, east toward the coast, running south midway between the coast and the road untill you encounter the fort. At the fort, head toward the top of the cliffs by the coast, then when you get to the south end of the fort, move west and go south along the mountain face as soon as it turns. Follow the southern coast then check the centaur canyons. Return to Razor Hill following the western mountain face. Go to the forge and smelt it all. This is the fastest way to develop mining up to about lvl 80.