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TitleAutomated indicator mineral analysis of fine-grained till associated with the sisson w-mo deposit, New Brunswick, Canada
AuthorLougheed, D H; Mcclenaghan, B M; Layton-Matthews, D; Leybourne, M I; Dobosz, A N
SourceMinerals vol. 11, issue 2, 103, 2021 p. 1-26, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20200681
PublisherMDPI AG
Mediapaper; on-line; digital
File formatpdf; html
ProvinceNew Brunswick
Lat/Long WENS -67.1000 -66.9167 46.4167 46.2167
Subjectsmineralogy; Science and Technology; indicator elements; heavy minerals; heavy mineral analyses; tills; till samples; mineralogical analyses; mineral deposits; intrusions
Illustrationslocation maps; diagrams; tables; graphs
Released2021 01 21
AbstractExploration under thick glacial sediment cover is an important facet of modern mineral exploration in Canada and northern Europe. Till heavy mineral concentrate (HMC) indicator mineral methods are well established in exploration for diamonds, gold, and base metals in glaciated terrain. Traditional methods rely on visual examination of >250 µm HMC material. This study applies mineral liberation analysis (MLA) to investigate the finer (<250 µm) fraction of till HMC. Automated mineralogy (e.g., MLA) of finer material allows for the rapid collection of precise compositional and morphological data from a large number (10,000-100,000) of heavy mineral grains in a single sample. The Sisson W-Mo deposit has a previously documented dispersal train containing the ore minerals scheelite, wolframite, and molybdenite, along with sulfide and other accessory minerals, and was used as a test site for this study. Wolframite is identified in till samples up to 10 km down ice, whereas in previous work on the coarse fraction of till it was only identified directly overlying mineralization. Chalcopyrite and pyrite are found up to 10 km down ice, an increase over 2.5 and 5 km, respectively, achieved in previous work on the coarse fraction of the same HMC. Galena, sphalerite, arsenopyrite, and pyrrhotite are also found up to 10 km down ice after only being identified immediately overlying mineralization using the >250 µm fraction of HMC. Many of these sulfide grains are present only as inclusions in more chemically and robust minerals and would not be identified using optical methods. The extension of the wolframite dispersal train highlights the ability of MLA to identify minerals that lack distinguishing physical characteristics to aid visual identification.

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