YUKON – Copper North Mining Corp. of Vancouver continues to advance the preliminary economic assessment for the Carmacks copper-gold project 220 km north of Whitehorse, and says the document should be completed in early May.
More metallurgical tests have been done on material from the project site. The work confirmed that an increase in leach temperature to 80°C improved copper recovery and allowed the flowsheet to be simplified, particularly in the cyanide circuit for leach recovery of gold and silver. The new PEA will reflect these changes.
Copper North plans to mine the copper oxide ore by open pit, crush it, and grind to 80% —664 microns. Leaching in an agitated tank will yield high recovery of copper with four hours of leaching time. The rinsed copper leach residues will be pumped to the cyanide circuit for leaching of gold and silver with leach time of approximately 12 hours. Cathode copper will be recovered by solvent extraction electro-winning (SX/EW) and the gold and silver would be recovered by Merrill Crowe process. Further test work is planned for the final determination of optimal leach parameters.
Please see www.CopperNorthMining.com for details of the proposed Carmacks development.