5 million tons of mining tailings entered the river every year until 1995, while the fumes from the smelter created acid rain in the area.
1995年前,每年有150万吨矿山尾矿进入河流,而冶炼厂的烟雾造成该地区的酸雨。
2
This material forms a thick, weighty and highly abrasive sludge that must be transported from the flotation cells, where the copper is extracted, to a mine tailings disposal area.