The BG Gold occurrence is located on the north side of Jock Creek, northwest of Nub Mountain.
Regionally, the area is situated within a Mesozoic volcanic arc assemblage, which lies along the eastern margin of the Intermontane Belt, a northwest-trending belt of Paleozoic to Paleogene sediments, volcanics and intrusions bounded to the east by the Omineca Belt and to the west and southwest by the Sustut and Bowser basins.
Permian Asitka Group crystalline limestones are the oldest rocks exposed in the region. They are commonly in thrust contact with Upper Triassic Stuhini Group andesite flows and pyroclastic rocks, and marine sedimentary and volcanic rocks of the Lower to Middle Jurassic Hazelton Group. These rocks have been intruded by plutons and other bodies of the mainly granodiorite to quartz monzonite Early Jurassic Black Lake Suite and are in turn unconformably overlain by or faulted against Lower Jurassic calc-alkaline volcanics of the Toodoggone Formation (Hazelton Group).
The dominant structures in the area are steeply dipping faults that define a prominent regional northwest structural fabric trending 140 to 170 degrees. In turn, high-angle, northeast-striking faults (approximately 060 degrees) appear to truncate and displace northwest-striking faults. Collectively these faults form a boundary for variably rotated and tilted blocks underlain by monoclinal strata.
The occurrence area is underlain by weak to moderately propylitically altered, intermediate to felsic fragmental volcanics and tuff of the Lower to Middle Jurassic Hazelton Group. The showings lie on the northeast side of the regionally extensive northwest-trending Pill fault.
Locally, a series of 0.1- to 0.8-metre-wide chalcedonic silica and amethystine breccia veins host gold and silver values. The veins strike 120 to 170 degrees and dip steeply northeast. In the immediate vicinity of the veins exposed in a landslide, alteration consists of silica and potassium feldspar after moderate propylitic alteration.
In 2003, grab samples yielded up to 3.1 grams per tonne gold and 75.1 grams per tonne silver (Assessment Report 27429).
In 2004, a sample (165969) over 0.10 metre of outcrop assayed 1.46 grams per tonne gold and 36.6 grams per tonne silver, whereas three outcrop samples (185266 to 185268) of potassic-altered andesite hosting quartz-calcite veins with pyrite, galena and chalcopyrite yielded from 0.09 to 0.14 gram per tonne gold, 13.3 to 16.7 grams per tonne silver, 0.119 to 0.183 per cent copper, 0.285 to 0.411 per cent lead and 0.540 to greater than 1.00 per cent zinc (Assessment Report 27790).
Work History
During 2003 through 2006, Stealth Minerals Ltd. completed programs of prospecting; geological mapping and rock, silt and soil sampling on the area as the JC claims of the Sickle-Sophia, Nub and Bee Gee properties.
During 2016 through 2018, Amarc Resources Ltd. completed programs of soil and rock sampling, geological mapping, 115.0 line-kilometres of ground induced polarization surveying and 1940.0 line-kilometres of airborne magnetic surveying on the area as the Joy property.
