4. What are the types of copper ore? There are two distinct types of copper deposits: sulfide ore and oxide ore. Currently, the most common source of copper ore is the sulfide ore mineral ...

The legislation would make permanent a 20-year ban on that type of mining on 225,000 acres of Superior National Forest in the ...

Jetti’s technology is currently used commercially by Capstone Copper Corp. in the US. “Jetti has a unique and commercially demonstrated technology for treating primary sulfide ores,” CEO ...

There have been no active sulfide mines in Wisconsin for decades. But a mining moratorium was repealed by Governor Scott ...

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 ...

Thick interval of visual copper sulfide identified in historical drilling supports the potential for discovery and highlights ...

Ore plus soap equals metal bubbles. Froth flotation of copper sulfide is similar to the process for extracting zinc sulfide. Source: Geomartin, CC BY-SA 4.0 Silver Valley galena typically assays ...

U.S. Sen. Tina Smith, D-Minn., has introduced a bill to ban copper-nickel mining on nearly a quarter-million acres of federal land in the same watershed as the Boundary Waters Canoe Area Wilderness.