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Happy Creek testing returns up to 61.9% copper leach recovery in three days from Zone 1, Rateria property Highland Valley
(via Thenewswire.ca) Vancouver, British Columbia / TNW-ACCESSWIRE / August 19 , 2014 ...
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[{"type":"text","content":"Happy Creek testing returns up to 61.9% copper leach recovery in three days from Zone 1, Rateria property Highland Valley(via Thenewswire.ca)\n \n \nVancouver, British Columbia / TNW-ACCESSWIRE / August 19, 2014 / Happy Creek Minerals Ltd. (TSXV: HPY) (the \"Company\") has received initial copper leach test results from its 100% owned Rateria property in the Highland Valley area, British Columbia. The company's property totals approximately 200 square kilometres in area that adjoins Teck's Highland Valley Copper mine property. \n\n \n \nA composite sample from drill core rejects (0.25% copper) was obtained from Zone 1 on the Rateria property and submitted to Met-Solve Laboratories, of Langley, B.C. for preliminary acid leach testing. Drilling and petrographic studies have shown that chalcocite is the predominant, leachable copper mineral occurring from surface to at least 400 metres below surface. The bottle roll sulfuric acid leach tests were performed on coarse and fine size samples obtained from crushed drill core rejects, and analyses were taken at 3 hours, 6 hours, 24 hours, 48 hours and 72 hours.\n\n \n \nSummary of Initial Copper Leach Results- Zone 1\n\n \n\nParticle size\n\n\n\n\nAcid\n\n\n\nConcentration (kg/t)\n\n\n\n\nAcid Consumption (kg/tonne)\n\n\n\n\n% copper recovery\n\n\n\n72 hours ( 3 days)\n\n\n\n\nCoarse (passing 2565 um)\n\n\n\n\n25\n\n\n\n\n58\n\n\n\n\n42.6\n\n\n\n\nCoarse (passing 2565 um)\n\n\n\n\n100\n\n\n\n\n72\n\n\n\n\n56.4\n\n\n\n\nFine (passing 168 um)\n\n\n\n\n25\n\n\n\n\n67\n\n\n\n\n52.9\n\n\n\n\nFine (passing 168 um)\n\n\n\n\n100\n\n\n\n\n76\n\n\n\n\n61.9\n\n\n \n \nResults indicate that appreciable copper in the Zone 1 material can be rapidly extracted using acid leaching techniques. Typical copper heap leach recoveries are 60-70% with time periods from 30 to 100 days and the product, after solvent extraction and electro-winning, is copper cathode. Acid consumption can decrease over longer time periods. These initial results are positive for the potential of copper heap leaching at Zone 1 and additional tests are required involving larger scale, longer leach period and costing of components.\n\n \n \nMet-Solve Laboratories comments \"the test results show potential leaching occurring at the 72 hour mark, especially the coarser material, suggesting it is maybe possible to reach higher recoveries ...