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TitleVHMS favourability mapping with GIS-based integration models, Chisel Lake-Anderson Lake area
DownloadFree download (whole publication) (zip 64950 KB)
AuthorWright, D F; Bonham-Carter, G F
SourceEXTECH 1: a multidisciplinary approach to massive sulphide research in the Rusty Lake-Snow Lake greenstone belts, Manitoba; by Bonham-Carter, G; Galley, A G (ed.); Hall, G E M (ed.); Geological Survey of Canada, Bulletin 426, 1996 p. 339-376, 387-401,
PublisherNatural Resources Canada
RelatedThis publication is contained in Bonham-Carter, G; Galley, A G; Hall, G E M; (1996). EXTECH I: a multidisciplinary approach to massive sulphide research in the Rusty Lake-Snow Lake greenstone belts, Manitoba, Geological Survey of Canada, Bulletin no. 426
NTS63K/16SE; 63J/13SW
AreaAnderson Lake; Chisel Lake; Ghost Lake; Stall Lake; Cook Lake; Morgan Lake
Lat/Long WENS-100.2500 -99.8667 54.8750 54.7500
Subjectsmathematical and computational geology; geophysics; geochemistry; volcanogenic deposits; sulphide deposits; mineral deposits; analytical methods; computer applications; bedrock geology; alteration; till geochemistry; lake sediment geochemistry; v l f surveys; gravity surveys; magnetic surveys; geophysical surveys; LANDSAT imagery; geographic information system applications; radar surveys
Illustrationssketch maps; analyses
Natural Resources Canada library - Vancouver (Earth Sciences)
Natural Resources Canada library - Calgary (Earth Sciences)
Geological Survey of Canada (Atlantic)
Natural Resources Canada Library - Ottawa (Earth Sciences)
Program1989-1994 Rusty Lake-Snow Lake Mining Camps, Canada-Manitoba Exploration Science and Technology [EXTECXH I] Initiative
Released1996 04 01
AbstractMaps showing spatial variation of volcanic-hosted massive sulphide (VHMS) potential in the Snow Lake area have been generated by combining digital data from a variety of sources. An exploration model, based on a volcanic-hosted massive sulphide deposit model, but expanded to include regional exploration data sets, provides a conceptual framework for the extraction of predictive evidence from the raw data sources. The evidence is divided into five factors: stratigraphic evidence, evidence related to available heat, alteration evidence, geophysical evidence, and geochemical evidence.
Three approaches have been applied for combining spatial evidence to predict mineral potential. (1) The weights of evidence method (data-driven) is used to characterize the spatial associations between the known deposits, and to calculate weights for each predictive map layer. (2) In the fuzzy logic method, evidence is expressed in terms of fuzzy membership functions, subjectively assigned by an expert, for each predictor map. (3) Dempster-Shafer belief theory is more flexible than fuzzy logic for representing uncertainty in the data, but is somewhat restricted in the expressiveness of the combination rules.
The resulting favourability maps from each method have similar patterns that show all the known deposits in highly favourable zones and a number of prospective areas that have the right combination of factors but no known deposits. The new volcanic-hosted massive sulphide discovery at Photo Lake made during summer 1994 is in a favourable zone as predicted by these models.