| By the end of 2006,70 tailings reservoirs(including small size),in five types of metal mines(mainly composed of iron and copper) of southeastern Hubei,have accumulated tailings in excess of a hundred million cubic meters.In the case of material components,the tailings is still clastic accumulation of raw ore through artificial-machanical crushing-grinding,but in appearance,it is mechanical sediment in condition of natural static water.Except for a few leadzinc mine tailings,the main available compositions i... |