In the Grizzly area, pyrite-chalcopyrite mineralization occurs at the boundary between the Hickman Batholith and adjacent volcanic rocks of the Stuhini Group. Mineralization occurs as disseminated sulphides, and also as small sulphide veinlets. The most intense mineralization occurs in fine grained volcanic siltstone unit that crops out within the Grizzly area. This mineralization is associated with moderate to intense K-feldspar-epidote-chlorite alteration. Scree and talus slopes around the mineralized outcrops have abundant float with malachite and azurite. This area was previously mapped and sampled by several historical workers (Betmanis, 1978; Raven, 1979; Greig 2009).

Historically the intrusive rocks in the Grizzly area have been mapped as part of the Early Jurassic Yehiniko Pluton, however, based upon Teck's mapping from 2015, these intrusion are re-interpreted to be Middle to Late Triassic granodiorite to quartz monzodiorite of the Stikine Plutonic Suite, similar to the Hickman Pluton further south.

In 2015 most of the sampling was done in the vicinity of the Late showing by Teck Resources. However, a cluster of samples were taken about 2 kilometres south from a steep-sloped area. A float sample volcaniclastic rock (sample 1143910) assayed 1.9 per cent copper, 0.47 gram per tonnes gold, 31.2 grams per tonne silver and 0.001 per cent molybdenum (Assessment Report 35967). Other samples taken in the area were were strongly anomalous but far less than sample 1143910, however they were outcrop samples.

In 1972, a fairly extensive work program was undertaken by Phelps Dodge Corporation of Canada Ltd on what later (in the 2000s) became the Greater Kopper claim of Charles Greig and Bernard Kreft (the Shaft North property). The Shaft North contains the Late occurrence (104G 063), on the upper reaches of Grizzly Creek, and the Arc occurrence (104G 078). The Phelps Dodge work occurred north of the Nab claims held by Paramount Mining Ltd (Assessment Report 3985). Phelps Dodge had optioned the property from Columbia River Mines Ltd., and their work program included prospecting, linecutting, geological mapping, a soil and silt geochemical survey, rock sampling, an induced polarization and resistivity survey, a magnetometer survey, cobra drill trenching, bulldozer trenching, helicopter pad and road construction, and diamond drilling. The focus of the grid work, and the geophysical surveys, was on the lower slopes of Mount LaCasse. A single hole was drilled near Grizzly Canyon lower down slope from Lake (104G 063). Phelps Dodge also ran an induced polarization and resistivity survey on the Arc and Rose grid in 1972, but only weak and apparently discontinuous anomalies were found (Assessment Report 3986).

See Late (104G 063) for related geological and Work History details. See Schaft Creek (104G 015) for details of Teck Resources work in the Grizzly vicinity and further south.