Crescent Valley NewsLocal news for Crescent Valley, NV continually updated from thousands of sources on the web.Cyanide Heap Biological Detoxification - Phase II- May 28, 2008 Many active mine sites, mines in the closure stage and some abandoned mines are and have utilized cyanidation to remove and recover precious metals.http://www.topix.net/city/crescent-valley-nv/2008/05/cyanide-heap-biological-detoxificatio... |