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TitleGlacial sediments geochemistry of the Bonaparte Lake map area (NTS 92P) in south central British Columbia
AuthorPlouffe, A; Bednarski, J M; Huscroft, C A; McCuaig, S J
SourceRoundup 2010: Go for the gold (and everything else), abstracts; by Association for Mineral Exploration British Columbia; 2010.
Alt SeriesEarth Sciences Sector, Contribution Series 20090341
MeetingCordilleran Roundup 2010: Go for the gold (and everything else); Vancouver; CA; January 18-21, 2010
Mediaon-line; digital
ProvinceBritish Columbia
AreaBonaparte Lake
Lat/Long WENS-122.0000 -120.0000 52.0000 51.0000
Subjectssurficial geology/geomorphology; economic geology; ice flow; ice retreat; ice movement directions; drift prospecting; drift deposits; glacial features; glacial deposits; glaciofluvial deposits; tills; lithology; glaciation; mineralization; mineral occurrences; mineral potential; gold; bedrock geology; base metals; Quaternary; Cenozoic
ProgramMountain Pine Beetle, Geoscience for Mountain Pine Beetle Response
A regional glacial sediment sampling program was recently completed over the Bonaparte Lake map area (NTS 092P) as part of the Mountain Pine Beetle Program. A total of 936 till and 14 glaciofluvial sediments samples were collected as part of this survey. The clay- and silt and clay-sized fractions plus the heavy mineral concentrates were analysed geochemically for a suite of elements. Interpretation of the till geochemistry needs to take into account the latest interpretation of the ice-flow history of this region. At the onset of the Late Wisconsinan Fraser Glaciation, ice was advancing from the Cariboo Mountains to the west and southwest over the region. As the glaciation intensified, ice from the Coast and Cariboo mountains coalesced over the Interior Plateau resulting in the development of an ice divide north of the map area from which ice was flowing to the south. In summary, the Bonaparte Lake region was under the influence of two dominant ice flows during the last glaciation: a first one to the west and a second one generally to the south.
Geochemical results indicate that a region northwest of Little Fort has the greatest potential for gold mineralization. Gold levels in till in that region are reaching anomalous concentrations. Similarly, some pathfinder elements (e.g. arsenic and silver) are depicting high levels in this same region. The Cretaceous Raft Batholith is an important source of rare earth elements (REE) in till. High REE levels in till are distributed to the west and to the south of the batholith as a result of the two ice-flow events. Base metals (copper, lead, and zinc) levels in till are enriched in regions underlain by volcanic and sedimentary rocks of the Nicola Group. These results will serve to focus and stimulate mineral exploration in south central British Columbia in a region severely impacted by mountain pine beetle infestation.