This Bureau of Mines paper reviews recent developments in the heap leaching of gold ores with dilute cyanide solution and the recovery of the gold and associated silver from the pregnant effluents by a carbon adsorption-desorption process. It describes mineralogical considerations, experimental work, field studies, and commercial operations. New process developments include the application of (1) alcohol additives to the conventional hot alkaline cyanide strip solution to enhance gold desorption from precious metal-laden activated carbon and (2) na2s precipitation of the associated silver from cyanide mill solutions as a means of reducing the inventory of carbon required for precious metal adsorption from heap leach effluents. Application of this procedure to carbon stripping effluents results in the production of low-silver bullion by subsequent electrowinning.
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.