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January 16, 2013
08:36 EDTANVAllied Nevada Gold provides update on 2012 metallurgical testing programs
Allied Nevada Gold is providing an update on the results of ongoing metallurgical test work conducted in 2012 in support of the Hycroft mill expansion. A comprehensive pilot plant scale program, primarily for the generation of concentrate products for oxidation testing, was completed for Hycroft mill material. The testing simulated our proposed flow sheet of primary crushing, grinding to 150 microns, rougher flotation, leaching to extract the non-refractory silver, pressure oxidation to extract the refractory gold and cyanidation. The results through this flow sheet indicated overall recoveries of approximately 79.7% for gold and 85.5% for silver. These results are an improvement of 1.7% for gold and 0.6% for silver as compared with the recoveries used in the technical report titled "Technical Report - Allied Nevada Gold Corp., Hycroft Mine, Winnemucca, Nevada, USA",. These results assume onsite autoclaving of rougher concentrate and do not account for offsite charges. If two-stage cleaning were included in this flow sheet, which may be done for certain concentrate sales agreements, testing indicated overall recoveries would be approximately 71.1% for gold and 81.0% for silver. The cleaning stage involves "rougher" concentrate reporting to a regrind mill where it is ground to 80% passing 45 microns and passed though cleaning cells to remove additional waste material, reducing the mass. These results are an improvement of 21.1% for gold and 11.5% for silver as compared to recoveries used in the April 2012 Technical Report.
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