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Rocky Mountain (56th Annual) and Cordilleran (100th Annual) Joint Meeting (May 35, 2004) Paper No. 7-5
 

Summary: Rocky Mountain (56th Annual) and Cordilleran (100th Annual) Joint Meeting (May 3­5, 2004)
Paper No. 7-5
Presentation Time: 9:40 AM-10:00 AM
PREG-ROBBING CARBON IN THE PROCESSING OF
GOLD-BEARING ORES: DEFINITIONS, ANALYTICAL
METHODOLOGY AND CHARACTERIZATION
TRETBAR, David, Metallurgical Services Dept, Barrick Goldstrike Mines, Inc, PO Box 29,
Elko, NV 89803, dtretbar@bgmi.com, AREHART, Greg B., Department of Geology, Univ
of Nevada Reno, MS 172, Reno, NV 89557-0001, and GRAVES, Robert S., Geological
Sciences, Univ of Nevada, Reno, Geological Sciences MS-172, University of Nevada, Reno,
Reno, NV 89557
Certain precious-metal mineral deposits, including the majority of the Carlin-type gold
deposits of northeast Nevada, are hosted in calcareous sedimentary rocks that contain
naturally-occurring carbonaceous material. Depending on the geological characteristics of
the deposit (i.e., original C content, sedimentary rock types, thermal history, extent of
alteration and mineralization, etc.) carbon can range in maturity from poorly­ordered
amorphous phases to highly-ordered crystalline graphite. The optimal processing of these
ores can be impeded the presence of `preg-robbing carbon', which is defined as
carbonaceous material that preferentially absorbs gold and gold-cyanide complexes. This
absorption can be a temporary phenomenon (termed `preg-borrowing'), and the gold and

  

Source: Arehart, Greg B. - Department of Geological Sciences, Mackay School of Mines, University of Nevada, Reno

 

Collections: Geosciences