The BG Copper occurrence is located on the north side of Jock Creek and 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 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, chalcopyrite and bornite veins and disseminations are hosted within chlorite-altered, mafic to intermediate volcanic rocks. Copper values are associated with illite and chlorite minerals.
In 2003, grab samples from the BG Copper occurrence yielded up to 3.6 per cent copper from fracture-hosted chalcopyrite and bornite mineralization, whereas selected maximum analytical values from various grab samples in this area include 1305 grams per tonne silver, 3.6 per cent copper, 0.27 per cent zinc and 0.16 per cent lead (Assessment Report 27429).
In 2004, a sample (165315) of malachite-stained outcrop assayed 159 grams per tonne silver and greater than 1.00 per cent copper (Assessment Report 27790).
Work History
In 1987, Skylark Resources Ltd. completed a program of rock and soil sampling and geological mapping on the area as the Pil and Lar claims.
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.
