The Nub Southwest occurrence is located at an elevation of approximately 1520 metres on a south-southwest trending ridge, approximately 6.5 kilometres west-southwest of the west end of Budd Lake, about about 206 kilometres north-northwest of the community of Germansen Landing.
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 area is underlain by undivided Lower to Middle Jurassic Hazelton Group volcanic rocks cut by feldspar porphyry dikes. Strong regional structures trend north-northwest and are accompanied by propylitic and argillic to advanced argillic alteration. Locally, a silicified tuff hosts disseminated pyrite, galena and specular hematite with gold and silver values and is associated with a vuggy silica zone to the east.
In 1995, a talus grab sample (173179) from the area assayed 0.145 gram per tonne gold (Assessment Report 24641).
In 2003, a rock sample (133604) assayed 3.45 grams per tonne gold, 977 grams per tonne silver and 0.626 per cent lead (Assessment Report 27492).
In 2018, a rock sample (743391) of quartz-pyrite vein hosted by a quartz monzonite, taken from a narrow creek valley approximately 1 kilometre to the southeast, assayed 0.165 gram per tonne gold, 24.4 grams per tonne silver, and 0.161 per cent lead (Assessment Report 38201).
In 1980 and 1981, Serem Ltd. completed programs of prospecting, geological mapping and rock, silt and soil sampling on the area as the Nub Mountain 1-5 claims. During 1987 through 1989, Toodoggone Gold Inc. completed programs of geological mapping, geochemical (heavy mineral, rock, silt and soil) sampling, trenching and a 248.0-line kilometre airborne magnetic and electromagnetic survey on the area as the Fine 1-4 claims.
In 1995, Electrum Resource Corp. completed a program of rock sampling and photogeological interpretation on the area.
In 2003 and 2004, Stealth Minerals Ltd. completed programs of prospecting, geological mapping and rock, silt and soil sampling on the area as the Nub claims.
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.
