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Grid Metals Reports Increased Nickel Cobalt Recovery to Bulk Concentrate in Mayville Testwork
TORONTO, ON / ACCESSWIRE / May 8, 2019 / Grid Metals Corp. (TSX-V: GRDM | USOTC: MSMGF) ("Gr...
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[{"type":"text","content":"Grid Metals Reports Increased Nickel Cobalt Recovery to Bulk Concentrate in Mayville TestworkTORONTO, ON / ACCESSWIRE / May 8, 2019 / Grid Metals Corp. (TSX-V: GRDM | USOTC: MSMGF) (\"Grid\" or \"the Company\") today provided an update on the metallurgical test work on samples from its Mayville Deposit located in southeastern Manitoba, Canada. The laboratory flotation testwork program was focused on determining whether a satisfactory bulk flotation concentrate could be produced which subsequently could be taken to copper/nickel separation in order to produce marketable concentrate products (Ni>10%; Cu>25%). Based on positive current test results the next phase of testwork has been commenced.Summary of Results A medium grade Mayville sample, selected by Grid Metals, grading 0.48% Cu; 0.24% Ni, 0.02% cobalt was subjected to a laboratory scale flotation program of rougher and cleaner flotation. The best performing bulk concentrate achieved (Float 7), contained a copper/nickel grade of 23% with a cobalt grade of 0.40%. The mineralogical composition was 19% pentlandite, 47% chalcopyrite, 22% pyrrhotite and 13% non-sulphide gangue. Recoveries to the bulk concentrate were nickel 69.8%, copper 90.1%, cobalt 51.7% and palladium 64.2%. The iron-S/Pn ratio was reduced from 11:1 in the feed to 1.34:1 in the concentrate, which is at a level considered acceptable for a bulk concentrate. Preliminary precious metals analysis suggest precious metals (palladium - platinum - gold) are being upgraded and recovered. The mineralogical character of the bulk concentrates produced from the sample are considered favourable for making marketable nickel and copper concentrates. DiscussionIn the 2014 Preliminary Economic Assessment (\"PEA\")* for the Makwa Mayville Project nickel recovery for the Mayville deposit was an average of 41%. As such, improving nickel recovery from Mayville and demonstrating the potential for a quality marketable nickel concentrate was an important recommendation of the PEA. There are ~105 million pounds of nickel in the Indicated category and 20 million pounds of nickel in the Inferred category in the current resource at Mayville (see table below).Mineralogical work has shown the cobalt is associated with pentlandite which is the recoverable mineral containing nickel. A certain level of pay-ability from smelters for cobalt ...