CHARACTERIZATION OF PALEOPROTEROZOIC STRUCTURES, AURIFEROUS QUARTZ VEINS, AND HOST ROCKS, FISHER PROPERTY, SEABEE GOLD OPERATION, SASKATCHEWAN, CANADA

The Fisher property is a part of the Seabee Gold Operation in northern Saskatchewan, which includes the active Santoy mine and the recently decommissioned Seabee mine. These Paleoproterozoic orogenic gold deposits are hosted by shear zones in the Pine Lake greenstone belt of the Glennie Domain, which has a complex geologic history related to accretionary episodes during the development of the Reindeer Zone of the larger Trans-Hudson Orogen. Similar brittle-ductile structures and lithological units hosting the Santoy and Seabee deposits are interpreted to extend to the Fisher property, located to the southeast of the Santoy mine, and is thus the focus of active exploration. Geological mapping in July 2019, focused on an east-west transect across these structures and rock types, will improve understanding of regional scale correlations. Sampling of variably altered rocks, and auriferous quartz (+/- pyrite, chalcopyrite, pyrrhotite) veins from outcrop and drillcore will supplement the 38 representative samples of host rocks from 8 drillholes along an 8 km trend of the Santoy shear zone. These have already been examined for their petrographic and geochemical characteristics. The host rocks are dominated by transitional to calc-alkaline basalts to dacites, with associated intrusives dominated by granodiorites and gabbros, that formed in a maturing continental arc. The mineral assemblages in the host rocks indicate that amphibolite grade conditions were reached across the property. The characteristics of alteration, and timing of mineralization will be obtained using a combination of petrography, lithogeochemistry, U-Pb on host rock and alteration minerals, and Re-Os on vein pyrite.