copper or iron ore mines Currently, open pitting is u sed for example at Los Santos (skarn, Spain), at Kara (sk arn, tungsten is by-product, Australia), for part of the p rod uc t ina Cg ( sk, ) v h e p era tin s.M f h culy md g j w ouda sb e ingp t . Some proposed tungsten mining projects call for mining rates of some 2 0, tp erd ay of lw ...Web