Gunnison Copper (TSX:GCU,OTCQB:EXMGF) is shifting its development strategy for the Gunnison copper project in Arizona, US, laying out plans for a conventional open-pit and heap-leaching operation. In ...

Dr. Stephen Twyerould, CEO, commented: "The positive outlook for copper prices, combined with advancement of sulfide leaching technologies, and the greater overall copper extraction afforded by open ...

Antimony recovery has minimal to no impact on gold recovery; the gold in the historical leach pads could also be recovered in the future after antimony processing is completed Acid Leaching is being ...

Get any of our free daily email newsletters — news headlines, opinion, e-edition, obituaries and more. Evidence abounds across Montana of the ruinous environmental legacy of cyanide-based open-pit ...