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TitleTill geochemical and indicator mineral methods in mineral exploration
AuthorMcClenaghan, M B; Thorleifson, L H; DiLabio, R N W
SourceOre Geology Reviews vol. 16, issue 3-4, 2000 p. 145-166,
LinksAbstract - Résumé
Alt SeriesGeological Survey of Canada, Contribution Series 1999005
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
ProvinceNewfoundland and Labrador; Quebec
Lat/Long WENS -64.5000 -63.5000 56.5000 56.2500
Lat/Long WENS -66.2500 -65.2500 44.5000 43.5000
Lat/Long WENS -84.0000 -74.0000 52.0000 48.0000
Subjectseconomic geology; geochemistry; sedimentology; surficial geology/geomorphology; till geochemistry; sediment geochemistry; drift prospecting; mineral exploration; glacial features; glacial deposits; sediment dispersal; diamond; kimberlites; gold
Illustrationslocation maps; geological sketch maps; schematic diagrams; cross-sections, stratigraphic
AbstractThis paper summarizes advances since 1987 in the application of glacial sediment sampling to mineral exploration drift prospecting. in areas affected by continental or alpine glaciation. In these exploration programs, clastic glacial sediments are tested by geochemical or mineralogical methods to detect dispersal trains of mineral deposit indicators that have been glacially transported from source by mechanical processes. In glaciated terrain the key sampling medium, till, is produced by abrasion, crushing and blending of rock debris and recycled sediment followed by down-ice dispersal ranging from a few metres to many kilometres. As a consequence of the mid-1980s boom in gold exploration, the majority of case studies and regional till geochemical surveys published in the past decade deal with this commodity. Approximately 30% of Canada and virtually all of Fennoscandia have been covered by regional till geochemical surveys that aid mineral exploration and provide baseline data for environmental, agricultural, and landuse planning. The most profound event in drift prospecting in the last decade, however, has been the early-1990s explosion in diamond exploration which has dramatically increased the profile of glacial geology and glacial sediment sampling and stimulated changes in sampling and analytical methods.

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