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TitleInvestigation of a molybdenite ore from Demfontaine Mines Company Limited, La Reine Township, Abitibi West, Quebec
DownloadNot digitized. Availability
AuthorMathieu, G I
SourceCanada Mines Branch, Investigation Report IR 65-80, 1965, 9 pages, Open Access logo Open Access
PublisherCanada Department of Energy, Mines and Resources
Mediapaper; on-line; digital
File formatpdf
Released1965 01 01
In the four lots of ore received, only the samples identified as "Zone 3" and "Zone 4" contained molybdenite in possibly economical quantity (0.65% and 0.35% MoS? respectively). Neither the precious metals nor the barium appeared in sufficient amount in any of the samples to justify investigation of specific techniques for their recovery. The mineralogy of the ore from La Reine Township was characterized by appreciable molybdenite being present as inclusions in pyrite and gangue minerals, particularly quartz. Consequently, it was necessary to regrind the molybdenite rougher concentrate -prior to cleaning stages to obtain final products of marketable grade (85% - . 90% MoS?). Flotation of the ore, following this procedure, resulted in concentrates assaying 87% to 93% with a recovery of about 77%. Addition of sodium cyanide reduced the copper content in the final concentrates from 0.3% to 0.03%. No other impurities exceeded permissible limits. The molybdenite concentrate contained 3.89 oz Ag/ton. By straight cyanidation, 61% of this silver was readily extracted. When the concentrate was roasted prior to cyanidation, the extraction was 78%.

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