Twin Metals, the company hoping to build an underground copper-nickel mine in the same watershed as the Boundary Water Canoe Area Wilderness, no longer plans to store its tailings behind a dam and ...
The safety of storing mining waste in a tailings basin has been a critical part of the debate over copper-nickel mining in northern Minnesota, with some environmental advocates warning that failures ...
SAO PAULO, Feb 21 (Reuters) - Brazilian steelmaker Gerdau SA plans to invest 300 million reais ($79.6 million) through 2021 to implement a mining process known as dry stacking in the Brazilian state ...
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