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TitlePreliminary field observations at the Klaza deposit and nearby Kelly and Cyprus porphyry centres, Dawson Range, Yukon
DownloadDownload (whole publication)
AuthorLee, W -S; Chapman, J B; Richards, J P
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 15-22, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Geological Survey of Canada, Open File 8358
File formatpdf
NTS115G/15; 115G/16; 115H/13; 115H/14; 115I/03; 115I/04; 115I/05; 115I/06; 115I/11; 115I/12; 115J/01; 115J/02; 115J/07; 115J/08; 115J/09; 115J/10
AreaDawson Range
Lat/Long WENS-142.0000 -138.0000 63.0000 61.7500
Subjectseconomic geology; tectonics; structural geology; geophysics; geochronology; mineral deposits; mineral exploration; mineral potential; porphyry deposits; epithermal deposits; metals; gold; silver; lead; zinc; copper; base metals; ore mineral genesis; ore controls; structural controls; alteration; intrusions; veins; dykes; veinlets; quartz; feldspar; pyrite; chalcopyrite; sulphides; carbonates; sphalerite; galena; stockworks; phenocrysts; mineralization; mineral zoning; drill core analyses; geophysical logging; metallogeny; paragenesis; hydrothermal systems; tectonic setting; brecciation; magmatism; structural trends; radiometric dating; argon argon dating; uranium lead dating; structural features; faults; fractures; bedrock geology; lithology; igneous rocks; intrusive rocks; breccias; Klaza deposit; Dawson Range Gold Belt; Mount Nansen Porphyry Complex; Kelly porphyry; Cyprus porphyry; Dip Creek Fault; Big Creek Fault; Ruby Range Plutonic Suite; Prospector Mountain Plutonic Suite; Casino Plutonic Suite; Carmacks Group Volcanics; Mount Nansen Group Volcanics; Whitehorse Plutonic Suite; Aishihik Plutonic Suite; Stikinia Terrane; Quesnellia Terrane; Yukon-Tanana Terrane; ore systems approach; fluid evolution; rhenium-osmium dating; Phanerozoic; Cenozoic; Tertiary; Mesozoic; Cretaceous; Jurassic
Illustrationslocation maps; geoscientific sketch maps; photographs; geochronological charts
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Porphyry systems
Released2018 01 19
AbstractThe Klaza deposit is a structurally controlled, polymetallic gold-silver-base metal intermediate sulphidation epithermal system, located within the Dawson Range Gold Belt, central Yukon. The Klaza deposit has four zones with varying vein complexity, ore grade and interaction with local porphyritic quartz-feldspar ('QFP') dykes. This study aims to develop a clear understanding of the genesis and fluid evolution of the Klaza deposit. Preliminary field observations include that the high gold-grade intervals of stockwork and sheeted quartz pyrite veins display two dominant structural orientations and phyllic (quartz-pyrite-sericite) alteration. Massive quartz-pyrite ± chalcopyrite goldbearing veins cut the stockwork and sheeted veins. Silver-rich base metal sulfide veins at Central Klaza cut both vein types, indicating an early, high grade gold mineralization event followed by a later Ag-rich event. The main mineralization stage is followed by late stage carbonate veins, which are largely unmineralized in the Central Klaza zone, but contain euhedral sphalerite and galena in the Western BRX zone. High resolution re-logging of drill core revealed subtle textural and compositional differences between dykes previously logged as undifferentiated 'QFP' across the Central Klaza zone. Three types of dyke compositions are distinguishable in the field based on quartz phenocryst abundance and cross cutting relationships. A Type 1 mafic dyke is cut by Stage 1 early quartz-pyrite veinlets. The Type 2 felsic dykes are cut by Stage 4 base metal veins, while the Type 3 intermediate dyke is in contact with Type 2 dykes and is uncut by mineralization.