While cyanide in mining is nothing new, using heap leaching to process gold didn't come along until the 1970s, McCullough said, when the first such mine was opened in Nevada.

Extrakt Process Solution LLC’s Non-cyanide solid-liquid separation and leaching technology, known as TNS, is being used by ...

Cyanide Heap-Leach mining. This type of mining is a controversial practice used worldwide to extract gold from "low-grade" ore deposits -- getting a little bit of gold from a lot ...

RENO, Nev., Aug. 08, 2017 (GLOBE NEWSWIRE) -- Itronics Inc. (OTC:ITRO), a diversified producer of GOLD'n GRO zinc fertilizers and silver products and a green technology development Company, today ...

The Colorado Supreme Court will become the battlefield Tuesday in a fight to ban cyanide heap leach gold mining and a counterattack to limit the role of counties in regulating the industry. The ...

A company in Leadville wants to truck 1.2 million tons of mining waste to a mill on the edge of town, use cyanide to extract gold and silver from the rocks, then return the hills to a more natural … ...