Canarc Resource Corp.: Metallurgical Testing of New Polaris Ores Improves Gold Recoveries to 95%.VANCOUVER, British Columbia British Columbia, province (2001 pop. 3,907,738), 366,255 sq mi (948,600 sq km), including 6,976 sq mi (18,068 sq km) of water surface, W Canada. Geography -- Canarc Resource Corp. (TSX TSX Toronto Stock Exchange (TSE before April, 2002) TSX Transfer from Stack Pointer to Index TSX True Space Extension :CCM CCM Contemporary Christian Music CCM Critical Care Medicine CCM County College of Morris (New Jersey) CCM Chama Cha Mapinduzi (political party, Tanzania) CCM CORBA Component Model )(OTCBB OTCBB See OTC Bulletin Board (OTCBB). :CRCUF) announces that metallurgical testing of gold ores from the New Polaris project in northwestern British Columbia has improved gold recoveries to the 95% level. Initial optimization work focused on grinding and flotation to liberate and concentrate the sulfide minerals containing gold. By grinding the ore to 95% minus 200 mesh and then running it through 3 cycles of rougher flotation with conditioning, 96.6% of the gold in the ore reported to the final concentrate, which graded 92 gpt gold. This gold concentrate was then subjected to testing for gold extraction Gold extraction or recovery from its ores may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore. by comparing pressure oxidation and bio-oxidation. Batch acid pressure oxidation (autoclave autoclave Vessel, usually of steel, able to withstand high temperatures and pressures. The chemical industry uses various types of autoclaves in manufacturing dyes and in other chemical reactions requiring high pressures. ) tests showed that 100% oxidation of the sulphide minerals could be achieved within 60 minutes, showing that New Polaris ores are very amenable to the autoclaving process. The oxidized oxidized having been modified by the process of oxidation. oxidized cellulose see absorbable cellulose. concentrates were then treated by cyanide leaching to achieve a 98.5% rate of gold extraction within 24 hours from concentrate, for an over-all gold recovery from ore of 95.1% a substantial increase over previous testwork. Bio-oxidation tests achieved up to a 93% extraction rate of gold from concentrate, for an overall gold recovery from ore of 88.9%. In summary, metallurgical testing has successfully increased gold recoveries from New Polaris ores to the 95% level, by optimizing the grinding, autoclaving and leaching processes. Bio-oxidation is still a possibility, even though it returned lower recoveries compared to autoclaving, because the anticipated capital costs are lower. However, the more likely metallurgical alternate now under consideration is the shipping of gold concentrates from the New Polaris minesite to an existing "third party" autoclave elsewhere in North America. Additional detailed metallurgical testwork will likely be needed for any feasibility study on New Polaris. Canarc Resource Corp. is a growth-oriented, gold exploration and mining company listed on the TSX (symbol CCM) and the OTC-BB (symbol CRCUF). The Company's principal assets are its 100% interest in the New Polaris gold deposit in British Columbia and its 80% option on the Benzdorp gold property in Suriname. Major shareholders include Barrick Gold Corp. and Kinross Gold Corp. On Behalf of the Board of Directors CANARC RESOURCE CORP. Bradford J. Cooke, President and C.E.O. The TSX has neither approved nor disapproved the contents of this news release. Canarc Resource Corp. (TSX:CCM) (OTC Bulletin Board OTC Bulletin Board An electronic quotation listing of the bid and asked prices of OTC stocks that do not meet the requirements to be listed on the NASDAQ stock-listing system. :CRCUF) |
|
||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion