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TitleInvestigation of a tungsten-molybdenum-bismuth ore from York Country, New Brunswick, for Burnt Hill Tungsten and Metallurgical Limited
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMathieu, G I; Bruce, R W
SourceCanada Mines Branch, Investigation Report IR 70-1, 1969, 32 pages, Open Access logo Open Access
PublisherCanada Department of Energy, Mines and Resources
Mediapaper; on-line; digital
File formatpdf
ProvinceNew Brunswick
Released1969 01 01; 2020 04 21
The ore sample contained tungsten, molybdenum and bismuth in economical amount with the following head assays: 1.02% W0?, 0.44% MoS? and 0.17% Bi. The tungsten occurred mainly as wolframite, the molybdenum as molybdenite, and the bismuth as native metal and bismuthinite. The wolframite and molybdenite had coarse mineralization (50 microns to 15 millimeters), whereas the bismuth minerals, at less than 50 microns in size, were finer-grained. Pyrite, marcasite and pyrrhotite were the main metallic impurities in the ore. Grinding to minus 48 mesh was sufficient for liberation. At this fineness, 89% of the tungsten, 94% of the molybdenite and 85% of the bismuth were recovered in rougher concentrates. The wolframite was concentrated by gravity (either jigging, spiralling or tabling), while the molybdenite and bismuth minerals were recovered by selective flotation. Because of the friable nature of the bismuthinite and the native bismuth, it was not necessary to regrind the ore prior to their concentration. To meet market specifications, it was necessary to upgrade the rougher concentrates by the following techniques: (1) tabling, magnetic separation and roasting (for desulphurization) of the tungsten concentrate; (2) cleaner flotation and acid leaching for the molybdenite concentrate; (3) gravity concentration or flotation-separation for the bismuth.

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