In his statement, Stauber says his bill would reinstate mineral leases in the area, describing that Biden's decision to ...

U.S. Rep. Betty McCollum (D-Minn.) reintroduced a bill on Jan. 21 to ban sulfide-ore copper mining in the Boundary Waters ...

or using mining loaders, low-slung payloaders specialized for operation in tight spaces. Ore plus soap equals metal bubbles. Froth flotation of copper sulfide is similar to the process for ...

This region is defined by its lakes, rivers, streams and high-quality wetlands. Mining for copper, nickel and other heavy metals is often referred to as “sulfide mining,” because these metals are ...

The permits could have allowed Antofagasta’s Twin Metals Minnesota to significantly expand its proposed sulfide-ore copper mine at the edge of the Boundary Waters Canoe Area Wilderness in northeastern ...

The world's first seafloor massive sulfide ... grade copper, gold, zinc and silver. As of October 2010, Nautilus has been preparing to commence production utilizing a newly constructed mining ...

Zinc sulfide concentrate leaching processes are essential for extracting zinc from its ores, particularly in the context of sustainable and efficient mining ... of zinc, copper, and indium from ...