The Ruf 41 occurrence, previously reported as the Mexican showing (Minister of Mines Annual Report 1903) and known as the Red Bluff zone later, is located near shore on the southeastern flank of Mount Kotzebue.

The area is underlain by calcareous siltstone, shale, limestone, conglomerate and breccia of the Upper Triassic Vancouver Group, Parson Bay Formation. These sediments have been intruded by granodiorite of the Jurassic Island Plutonic Suite.

The occurrence lies in calcareous sediments. The sediments have undergone extensive northeast and northwest faulting. Microdiorite dikes of the Jurassic Island Plutonic Suite have intruded and locally silicified or skarned the sediments. Abundant diorite float suggests the presence of an intrusive east of the occurrence.

A gossan on the Ruf 41 claim (the Klaskino 17, 18, 33, 34 claims in Leighton's 1973 report) contains abundant pyrite and pyrrhotite with some finely disseminated chalcopyrite, as thin discontinuous replacement lenses in limy sediments. Skarn minerals comprise actinolite and chlorite. The mineralized zone measures 900 by 600 metres, and includes scattered dry-fracture molybdenite and stockwork quartz-molybdenite mineralization.

Values up to 0.7 per cent copper were obtained near faults (D.G. Leighton, 1975, page 3).

In 1989, a sample (KLA-49) assayed 1.11 per cent copper and 5.5 grams per tonne silver (Assessment Report 20094). In 2009, eight of twelve samples returned values greater than 0.1 per cent copper and up to 9 grams per tonne silver (Assessment Report 31164).

In 2013, a rock sample (90406) of oxidized and cooked(?) sediment hosting pyrrhotite and chalcopyrite yielded 0.186 per cent copper, whereas a sample (90804) of oxidized sediments hosting pyrite yielded 0.102 gram per tonne gold (Assessment Report 34710).

In 2016, a rock sample (KL0022) from the southern end of the mineralized zone, located near the shoreline road, assayed 0.105 per cent copper (Assessment Report 36648).

In 2018, a grab sample (KL0038) of chlorite-altered microdiorite(?) hosting disseminated pyrite and chalcopyrite from the northern end of the mineralized zone, located on a logging road following a ridge line, assayed 0.175 per cent copper (Assessment Report 37707).

Work History

In 1970, Belvedere Mines completed programs of geological mapping and soil geochemical sampling. This work identified the Camp Creek/West (MINFILE 092L 144) and Red Bluff zones. In 1973, Brinex optioned the property and completed a program of geological mapping and soil geochemistry.

In 1989, the claims were re-staked by Ron Biliquest and a prospecting program was completed.

In 2009, Centerfire Minerals acquired the property and completed programs of prospecting, geochemical sampling and ground geophysical surveys. In 2013, R.J. Bilquist completed a minor program of geological mapping and rock sampling on the area as the Klaskino property. The following year, Homegold Resources Ltd. completed an air photo geological interpretation program on the area as the Kluska 2 claim. During 2016 through 2019, R.J. Bilquist completed a minor program of geochemical (rock and silt) sampling and geological mapping on the Klaskino property.