Clifton Star Resources Inc. (“Clifton Star” or the “Corporation”) (TSXV-CFO; Deutsche Boerse-C3T) is pleased to report that it has successfullycompleted a continuous pilot plant test at SGS Minerals at Lakefield, Ontario, Canada. The tests and analyses were carried out from March to August 2013 to confirm gold recoveries using flotation, pressure oxidation and cyanidation. The tests were highly successful and confirmed earlier bench results.
Highlights: Continuous flotation pilot plant testing was conducted to make a Bulk Concentrate for Pressure Oxidation (POX) pilot testing and also, as an alternate process, to simply produce a High Grade Gold Concentrate that could be sold directly to Smelters. For the POX process, the Bulk Concentrate produced by flotation assayed 26.8 g/t Au with an average 91.7% gold recovery. After applying POX to the flotation concentrate and cyanide leach to the flotation tailing, the overall average recovery of gold was 92%. Further work has shown that this can reach 94% by using a hot lime treatment of the POX product before cyanidation.
For the Gold Concentrate process, the concentrate assayed an average of 49.9 g/t Au, 50.0 g/t Ag and 31.4% S. Flotation recoveries averaged 86.5% for gold. The flotation tailing was cyanide leached and this raised the overall gold recovery to 91.9%. These concentrates could likely be sold, without further processing to Smelters.