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93% Cu Recovery in a Stirred Tank Bioleach Amenability Tests Performed on Haib Copper Mineralized Material from Namibia
(via TheNewswire) Vancouver, B.C., Canada - TheNewswire - August 28, 2...
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[{"type":"text","content":"93% Cu Recovery in a Stirred Tank Bioleach Amenability Tests Performed on Haib Copper Mineralized Material from Namibia(via TheNewswire)\n \n \nVancouver, B.C., Canada - TheNewswire - August 28, 2019 - Deep-South Resources Inc. (\"Deep-South\" or \"the Company\") (TSXV:DSM) announces results from microbial-assisted stirred tank leach amenability tests performed on stockpile material from the Haib Copper Project in Namibia. The test work program is managed by METS Engineering of Australia and undertaken by Mintek in South Africa.\n\n \n \nBioleach test work results summary:\n\n \n \nTwo tons of feed material was collected for the test work. The samples were removed from a stockpile extracted from an adit dug in the higher grade area of the main Haib deposit. The samples have not been weathered and are considered representative of the sulphide mineralized material at Haib.\n\n \n \nThe tests were performed on fine-milled material as a pre-cursor to column leach test work in order to indicate the maximum copper dissolution that can be achieved at 65oC in the absence of liberation restraints (as would be present in coarse rocks).\n\n \n \nDuplicate batch bioleach amenability tests were performed on fine-milled (P80 of 75 um) mineralized ore in 2 L agitated tanks. Copper dissolutions of 90.5% and 93.1% were obtained after 54 days, corresponding to recalculated copper head grades of 0.69% and 0.71%, respectively. Copper dissolution profiles are presented in \n\n\n \nFigure 1. Stirred tank copper dissolution profiles\n\n \n \n\nClick Image To View Full Size\n\n \n \nSix - 1 metre columns have been initiated at Mintek on -4.7mm, -3.35mm and -2.36mm mineralized material and the copper leaching recovery is progressing ahead of plan. It is important to note that the expected leaching time period in columns will be longer than in stirred tanks.\n\n \n \nMr John Akwenye, Chairman of Deep-South stated that: \"the bio-assisted leaching results combined with grade upgrading ore sorting results, HPGR and agglomeration are highly promising and demonstrate that we are on the right path to extract the metal at Haib at low costs and low capital expenditures.\"\n\n \n \nThere are no deleterious elements. The mineralogy of the milled Haib feed revealed that 98.5% of the total copper content occurred as chalcopyrite, 1% as bornite, and less than 0.5% a...