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TitleMacroscopic control on Carlin-type gold mineralization in north-central Yukon
DownloadDownload (whole publication)
AuthorPinet, N; Sack, P J
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 89-103, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Geological Survey of Canada, Open File 8549
File formatpdf
NTS106C/01; 106C/02
AreaNadaleen River
Lat/Long WENS-133.0000 -132.0000 64.1667 64.0500
Subjectseconomic geology; sedimentology; structural geology; mineral deposits; gold; replacement deposits; sedimentary ore deposits; mineral exploration; mineral potential; ore mineral genesis; mineralization; ore controls; drillholes; geophysical logging; bedrock geology; lithology; sedimentary rocks; limestones; mudstones; conglomerates; grainstones; landslide deposits; debris flow deposits; breccias; porosity; permeability; bedding planes; fluid flow; transport mechanisms; sedimentary structures; structural features; fractures; faults; faults, thrust; folds; anticlines; synclines; intrusions; dykes; Rackla Belt; Sunrise Prospect; Osiris Prospect; Osiris Limestone; Gametrail Formation; Osiris Mudstone; Nadaleen Formation; Neoproterozoic; Nadaleen Fault; Osiris Fault; Osiris Anticline; ore systems approach; Carlin-type deposits; rudstones; floatstones; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; photographs; cross-sections; geophysical logs; profiles; charts; plots; schematic representations; lithologic sections
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Gold ore systems - tectonic drivers and conduits
Released2019 03 01
AbstractThis open file summarizes observations from diamond drillhole logging on a section through the Sunrise prospect, in north-central Yukon, and to a lesser extent the Osiris prospect. Carlin-type mineralization is hosted in a lime-mudstone unit (Osiris limestone, Neoproterozoic Gametrail Formation) bounded on both sides by a non-calcareous mudstone unit (Osiris Mudstone, Nadaleen Formation), which is interpreted to have low porosity and permeability. This geometry provides first-order control on mineralized zones that are grossly concordant with bedding. Discontinuous rudstone and floatstone intervals in the Gametrail Formation also played an important role in focussing mineralizing fluids and influenced the location, geometry, and characteristics of orebodies. Clast-supported rudstone intervals (flat pebble conglomerate) deposited through short-transport gliding acted as impermeable barriers, whereas matrix supported floatstone and coarse grainstone intervals, deposited through debris flows, preferentially channelled fluids. Variation of the pre-mineralization fracture permeability, due to bed thickness and lithology or specific tectonic features (e.g. cataclastic zone, fold hinge zone), also influenced the location of the mineralization.