| Title | Investigation of a molybdenite ore from Demfontaine Mines Company Limited, La Reine Township, Abitibi West, Quebec |
| Download | Not digitized. Availability |
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| Author | Mathieu, G I |
| Source | Canada Mines Branch, Investigation Report IR 65-80, 1965, 9 pages, https://doi.org/10.4095/325328  Open Access |
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| Year | 1965 |
| Publisher | Canada Department of Energy, Mines and Resources |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Quebec |
| Released | 1965 01 01 |
| Abstract | (Summary)
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%. |
| GEOSCAN ID | 325328 |
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