In the gold-mining process, the precious metal is often extracted from low-grade ore in a technique known as gold cyanidation. As its name suggests, the process utilizes highly-poisonous cyanide, some ...

Dear EarthTalk: Most gold mining operations use cyanide to extract gold from surrounding rock. What are the environmental implications of this, and are there alternatives? --J. Pelton, via e-mail ...

Refractory gold ores present significant challenges to conventional extraction methods. In these ores, gold is tightly encapsulated within sulphide minerals or locked by carbonaceous matter, thereby ...

In mining, cyanide spills can cause fish kills and other problems, most recently at a river in Ghana last week downstream from a gold mine. While cyanide in mining is nothing new, using heap leaching ...

Getting your Trinity Audio player ready... A company that wants to extract gold from piles of decades-old mining waste outside Leadville no longer plans to use cyanide in its processes after hearing ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

Getting your Trinity Audio player ready... LEADVILLE — Millions of tons of waste from decades-old mining operations sit in the hills east of town. The brown and orange piles of abandoned ore rise 30 ...

After a long and contentious public comment process, Desert Mineral Mining received a permit last spring to build a cyanide-leaching gold mill 20 miles east of Boise. Now the company has decided to ...

To assist mining companies in managing and recovering cyanide, engineering consultancy AZMET Technology & Projects developed the AZMET cyanide recovery process (AZ-CRP) to provide an alternative to ...