Tailings Ponds Are the Biggest Environmental Disaster You Last Monday a tailings pond dam holding waste from the Mount Polley gold and copper mine in British Columbia broke spilling billions of gallons of toxic sludge -tailing of copper mine-,Leaching of heavy metals from Dexing copper mine tailings Trans Nonferrous Met Soc China 23 2013 3068âˆ'3075 Leaching of heavy metals from Dexing copper mine tailings pond Yao-guang GUO Peng HUANG Wu-gang ZHANG …… Get More