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TitleLaboratory and pilot plant investigation on molybdenite-bismuth ores from Moly Hill Mining Corporation Limited, Rouyn, Quebec
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMathieu, G I
SourceCanada Mines Branch, Investigation Report IR 67-27, 1967, 25 pages, Open Access logo Open Access
PublisherCanada Department of Energy, Mines and Resources
Mediapaper; on-line; digital
File formatpdf
Released1967 01 01; 2020 04 21
Three ore samples were received for pilot plant and laboratory investigation. These were identified as Central Zone, West Zone "A" and West Zone "B", and contained 0. 13 to 0. 46% MoS? 0. 028 to 0. 25% Bi and 0. 03 to 0.66 oz Ag/ton. Bulk flotation tests were made on each of the ores separately, and on two appropriate combinations. The recoveries obtained varied from 89. 5 to 97.6% for the molybdenite, 55.4 to 89. 0% for the bismuth and 58.1 to 97.2% for the silver, with the best results corresponding to the higher grade ores. All the bulk concentrates were leached in hydrochloric and nitric acid to extract the bismuth and to remove some of the contaminants. The molybdenite concentrates left after leaching met the specifications of commercial grade, with the exception of the residue from the West Zone "B" ore which assayed 81. 6% MoS?. However, it was possible to obtain a final molybdenite concentrate of over 90% MoS? with this ore by either reflotation after leaching or by molybdenite separation from bulk concentrate before leaching. A molybdenite concentrate meeting some specifications for lubricant grade was produced by regrinding and cleaner flotation of the leached concentrate from the Central Zone ore.

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