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TitlePhase immiscibility and SEDEX mineralisation at Nidd, Macmillan Pass, Yukon Territory
AuthorMagnall, J M; Gleeson, S A; Paradis, S
SourceGeological Survey of Canada, Scientific Presentation 23, 2014, 1 sheet, (Open Access)
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf
ProvinceBritish Columbia; Yukon
NTS105F; 105G; 105H; 105I; 105J; 105K; 105N; 105O; 105P
Areasoutheastern British Columbia; Howard's Pass; Gataga; MacMillan's Pass
Lat/Long WENS-133.0000 -128.0000 63.0000 61.0000
Subjectseconomic geology; mineralogy; stratigraphy; sedimentary ore deposits; mineral deposits; zinc; lead; mineralization; paragenesis; sedimentary basins; fluid inclusions; lithology; sedimentary rocks; shales; siltstones; conglomerates; mudstones; petrography; Tom Deposit; Jason Deposit; Nidd Deposit; Selwyn Basin; Earn Group; Lake Formation; Macmillan Pass Member; SEDEX deposits; Paleozoic; Cambrian; Silurian; Proterozoic; Devonian
Illustrationslocation maps; stratigraphic columns; photomicrographs
ProgramTargeted Geoscience Initiative (TGI-4), TGI-4 Program Coordination
Released2014 05 12
Summary(Plain Language Summary, not published)
Macmillan Pass, Yukon, is located approximately 390 km NE of Whitehorse and is host to SEDEX deposits, Tom and Jason, where inferred resources are 13.5 Mt and 11 Mt, respectively. Base-metal sulphides are hosted within late Devonian basinal sediments. These sediments are interpreted to have been deposited in a basin with a stratified water column, whereupon base metal mineralization occurs as a synsedimentary precipitate upon hydrothermal fluid exhalation above the sediment water interface. Preliminary observations and results are: - Mineralization in the bedded ore facies at Tom is dominantly of replacement origin. - Mineralizing fluids contain a low-salinity, CO2-bearing fluid inclusion assemblage that displays evidence of fluid boiling. These observations suggest modifications to the existing models and further research.