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Noble Mineral Exploration - Exploration Update: Holdsworth Oxide Sand Project Preliminary Metallurgical Results
Toronto, Ontario - TheNewswire - November 2, 2020 - Noble Mineral Exploration Inc. ("Noble" or the "Company") (TSXV:NOB) (FRANKFURT:NB7) (OTC:NLPXF) is pleased
About this update from Noble Mineral Exploration Inc.
[{"type":"text","content":"Toronto, Ontario - TheNewswire - November 2, 2020 - Noble Mineral Exploration Inc. (\"Noble\" or the \"Company\") (TSXV:NOB) (FRANKFURT:NB7) (OTC:NLPXF) is pleased to announce that, it has received metallurgical test results from Montreal-based Dundee Sustainable Technologies Inc., (\"Dundee\" or \"DST\") on Gold and Silver recoveries from The Holdsworth Oxide Sands Property (the \"Property\"), located 25 kilometres northeast of Wawa, Ontario in Corbiere and Esquega Townships. A 20 kg oxide sand sample recently taken from the Property and assaying 7.93 g/t Au and 61.3 g/t Ag was submitted to Dundee for metallurgical testing using its patented CLEVR Process(TM) \"CLEVR\". The oxide sand material was prepared (ground, mixed, homogenised & split) prior to being concentrated by flotation. Two distinct flotation tests were conducted and generated concentrate products containing 35.84 g/t Au (Flotation #1) and 33.19 g/t Au (Flotation #2). Gold recoveries from the flotation stage ranged between 50% and 52% with mass pulls of 8.6% (Flotation #1) and 10.7% (Flotation #2). The Flotation #2 concentrate was submitted to both an oxidation and acid leaching pre-treatment prior to the gold and silver extraction. Using CLEVR, 97.7% of the gold in the concentrate was recovered and 43.2% for silver. Concentration in ppm (Mass in mg) Sample Ag Au NBL-BS-F2-C (Flotation) 286.95 (43.1) 33.19 (4.98) NBL-BS-F2-C-OX (calcine) 336.4 (42.7) 38.35 (4.87) NBL-BS-F2-C-OX-LA (residue) 285.1 (25.1) 53.82 (4.74) NBL-BS-F2-C-OX-LA-CL (residue) 164.41 (14.25) 1.26 (0.109) Metal Extraction using CLEVR in % 43.2% 97.7% Noble's next step would be to optimize the flotation process in order to further increase precious metal recoveries with the goal of generating a marketable gold-silver rich concentrate and/or substantially reduce the amount of material that will have to be pre-treated and leached. Vance White is quoted as saying: \"The test work conducted by DST demonstrated that gold, from a flotation concentrate, may be leached, efficiently, post oxidation and acid leaching pre-treatment. We are very pleased that we can recover the gold from the flotation concentrate in the high 90% range and silver in the 40% range from the Holdsworth oxide sands and since the sulphur content in the samples that were tested is very low, the extraction process would no...