Till geochemical signatures of the Mount Pleasant Sn-W-Mo-Bi-In deposit, New Brunswick / [by] M.B. McClenaghan ... [et al.]. : M183-2/7722E-PDF

A till geochemistry study was carried out around the Mount Pleasant Sn-W-Mo-Bi-In deposit as part of the Geological Survey of Canada's (GSC) Targeted Geoscience Initiative 4 (TGI-4), a collaborative federal geoscience program with a mandate to provide industry with the next generation of geoscience knowledge and innovative techniques that will result in more effective targeting of buried mineral deposits. The <0.063 mm fraction of till clearly defines glacial dispersal at least 0.5 km down-ice of the North Zone and 1 km downice of the Fire Tower Zone. Indicator elements in till for this deposit include the main ore elements Sn, W, Mo, Bi and In. Pathfinder elements include Ag, As, Cd, Cu, Pd, Re, Te, Tl, and Zn. The Mount Pleasant deposit is a significant source of In and this study is one of the first to report a glacial dispersal pattern for In in till. Till overlying and just down-ice of the deposit contains between 1 and 13 ppm In, some of the highest In values ever reported for till. The study compared the efficiency of an aqua regia leach versus a lithium metaborate/tetraborate fusion followed by nitric acid digestion (total digestion) for determining metal contents in till. Results indicate that a total digestion is required to report the total concentration of Sn and W in till. On the other hand, aqua regia is suitable for determining the other indicator and pathfinder elements.

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