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Blind Creek Resources Announces Metallurgical Results for Blende Zinc-Lead-Silver Deposit
VANCOUVER, April 18, 2018 /CNW/ - Blind Creek Resources Ltd. (TSX-V: BCK) – ("Blind Creek" or the "Company") reports the Company has received a metallurgical te
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[{"type":"text","content":" VANCOUVER, April 18, 2018 /CNW/ - Blind Creek Resources Ltd. (TSX-V: BCK) – (\"Blind Creek\" or the \"Company\") reports the Company has received a metallurgical testing report from BV Minerals - Metallurgical Division for the Company's potentially open pit Blende Zinc-Lead-Silver Project, situated 64 kilometres northeast of Keno Hill, Yukon, Canada. In November, 2017 Mr. Frank Wright, P.Eng., commenced a preliminary four month staged metallurgical test program entailing characterization and optimization studies for comminution, dense media separation (DMS), flotation, liquid/solid (LS) separation and concentrate characterization on 175 kilograms of mineralized split drill core samples obtained from the Blende Deposit, which had been stored on site for several years. Despite an elevated extent of sulphide oxidation the test results showed a good response using conventional mineral processing procedures. Head grades ranged from 1.5% to 5.4% for lead, 1.5% to 3.5% for zinc, along with 17 to 65 g/t for silver. Based on the ratio of sulphide to total sulphur analysis the extent of oxidation ranged from 32% to 92%. Studies concluded the Blende Deposit has an average oxide content of 21% which allows for recovery of both sulfides and oxides at the recoveries used in the recently released Blende National Instrument (NI) 43-101 Mineral Resource Estimate. (News Release April 11, 2018) As a means of pre-concentration prior to milling, Blende metallurgical samples were subjected to DMS at a pre-screened particle size from ¼\" (6.3 mm) to 1\" (25 mm). The samples responded favorably with the grades of the concentrate close to double that of the DMS feed grades. When including screened fines, the metal recovery ranged from 85% to 90% for lead; and 82% to 86% for zinc, while rejecting approximately half the feed mass. Differential flotation performed on the drill core samples also provided an encouraging initial response without the need for fine grinding. While further optimization is required, a satisfactory response was evident at a relatively moderate grind of a particle size distribution 80% passing 110 microns. Locked cycle and continuous testing flotation was not performed for this initial portion of testing on the Blende samples. The estimated flotation recoveries are from the open cycle tests, which include cleaner t...