The Northern No. 7 occurrence is located about 1200 metres west of American Creek, just below the Mitre Mountain icefield, and approximately 1300 metres northwest of the north end of Kimball Lake.
The showing is on the western flank of the north plunging American Creek anticline. The American Creek fault trends north-northeast along the course of the valley. Other faults are parallel and oblique to the major fault; they trend north-northeast, northwest, northeast and approximately east. An assemblage of Lower Jurassic Hazelton Group rocks underlie the west valley wall. These rocks strike north to northeast and dip west. Lowermost argillites and an overlying siltstone-tuff assemblage (Unuk River Formation) are succeeded upwards by a green, maroon and reddish fragmental assemblage (Betty Creek Formation). Green felsic and granodiorite porphyry dikes are locally conspicuous.
The showing consists of a siliceous replacement zone in sheared greenstone. Mineralization, striking northwest and apparently dipping southwest, consists of sphalerite, galena and pyrite. Selected mineralization assayed 582.9 grams per tonne silver, 0.69 gram per tonne gold, 4.5 per cent zinc, 2.9 per cent lead and trace copper (Minister of Mines Annual Report 1937, page 21). In 2006, a drillhole (2006-FR-1) on the Coates showing intersected 0.91 metre of 0.01 gram per tonne gold, 132.6 grams per tonne silver, 0.009 per cent copper, 0.26 per cent lead and 0.34 per cent zinc (Assessment Report 28726).
Approximately 70 metres to the northwest, and possibly on strike with the showing, similar mineralization is up to 5.2 metres wide over a length of 20 metres. A composite chip sample from 3 opencuts, representing a width of 2.7 metres, assayed trace gold, 480 grams per tonne silver, 4.2 per cent zinc, 1.0 per cent lead and trace copper (Minister of Mines Annual Report 1937, page 21).
During 1931-37, Northwestern Aerial Prospectors Limited held a group of claims on the west side of American Creek, including the Northern 1-8 claims. The showing was discovered on the Northern No. 7 claim in 1931. Work was conducted intermittently on the showing until 1937. In 1938, Napco Gold Mines Ltd. acquired the claims. No further work has been reported. In 2006, Mountain Boy Minerals Ltd. and Pinnacle Mines Ltd. conducted an exploration program on the FR 1 and 4 claims consisting of geochemical sampling along the Lilianne vein (104A 112) and diamond drilling to test the silver tenor of the Moonlight (104A 005) and Coates showing. A total of 1307.61 metres of BTW drill core was completed in 15 separate drillholes fiom two different pads.
