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File Created: 22-Mar-1989 by George Owsiacki (GO)
Last Edit:  15-Aug-1996 by Keith J. Mountjoy (KJM)

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NMI
Name ALASKA (L.2938) Mining Division Greenwood
BCGS Map 082E045
Status Prospect NTS Map 082E06E
Latitude 049º 24' 25'' UTM 11 (NAD 83)
Longitude 119º 03' 04'' Northing 5474718
Easting 351207
Commodities Silver, Gold, Copper, Lead, Zinc Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Omineca Terrane Plutonic Rocks, Harper Ranch
Capsule Geology

The Alaska (Lot 2938) prospect is located 2.75 kilometres west of the summit of Goat Peak and 4.25 kilometres south-southeast of Beaverdell, British Columbia (Assessment Report 12734). The Alaska Reverted Crown grant was forfeited February 15, 1994.

Initial prospecting began in the Beaverdell area in the late 1880s. The first ore was shipped in 1896. The major producing mines in the Beaverdell silver-lead-zinc vein camp, from west to east, were the Wellington (082ESW072), Sally and Rob Roy (082ESW073), Beaver (082ESW040), and Bell (082ESW030), with numerous other small workings throughout the area.

The first recorded development on the Alaska claim was in 1918. In this year, J. Kelly and associates developed workings on the claim. Further development occurred in 1935 under lease to a Penticton syndicate represented by L. Smith. In 1947 and 1948 further work was carried out by Highland Silver Mines Ltd. Recent interest in the property was by Canstat Petroleum Corp., in 1982 and 1983.

Granodiorite of the Westkettle batholith underlies most of the area. It has been intruded by small quartz monzonite porphyry stocks including the Eocene Beaverdell, Tuzo Creek, Eugene Creek and Carmi stocks. Other granitic porphyry stocks that intrude the Westkettle batholith are the Eocene Beaverdell porphyry. The Westkettle batholith has been correlated with the Nelson intrusions that have been dated by potassium-argon and uranium-lead methods as Middle Jurassic. The Westkettle batholith contains remnants of pendants and/or screens of metamorphosed Wallace Formation. The Wallace Formation is believed to be correlative with the upper (Permian) section of the Carboniferous to Permian Anarchist Group. Lithologies include metamorphosed andesitic tuffs and lavas, hornblende diorite porphyries, olivine gabbro and hornblendite, hornfels and minor limestone. The contact between the Wallace Formation and the Westkettle batholith is sinuous, trending north with gentle east dips. These are unconformably overlain by Oligocene tuffs and conglomerates and Miocene plateau basalts. Westkettle granodiorite or Beaverdell quartz monzonite are the dominant hostrocks. Mineralization rarely extends into the Wallace Formation to the east. A series of dikes, ranging in composition from quartz latite and quartz monzonite porphyries to hornblende andesite porphyries, are found throughout the area. In the Beaverdell camp, fine-grained, brown andesite dikes, referred to as Wellington-type dikes, are believed to be pre-mineralization. Quartz latite dikes are referred to as Idaho-type dikes and thought to be syn or post-mineralization.

Beaverdell silver-rich veins are found in a 3.0 by 0.8 kilometre belt, referred to as the Beaverdell silver-lead-zinc vein camp. The mineralized veins are fissure-hosted, formed along east-trending faults in the west portion of the Beaverdell camp, and northeast- trending faults in the east portion of the camp. Faults have been classified into five types based on their orientation, with each type having common orientation, kind of movement and age relationship. The northeast-striking, high angle normal faults pose the greatest obstacle to systematic exploration and mining, as these faults are commonly spaced a few metres apart dividing veins into short segments in a northwest downward direction.

Vein-type mineralization of the Beaverdell camp is characterized by a high silver content. Mineralization is composed of galena, sphalerite and pyrite with lesser amounts of arsenopyrite, tetrahedrite, pyrargyrite, chalcopyrite, polybasite, acanthite, native silver and pyrrhotite. The gangue minerals in veins are mainly quartz with lesser amounts of calcite, fluorite and sericite with rare barite.

The Alaska (Lot 2938) adjoins the Buster claim (082ESW036) in the north and the Gold Drop Fraction claim (082ESW041) in the west-southwest. The property is underlain by chloritic altered granodiorite of the Westkettle batholith. A mineralized quartz vein system striking 110 degrees and dipping vertical occupies a shear zone in the granodiorite. The veins range from 8 to 40 centimetres in width and are mineralized with pyrite, chalcopyrite, galena and locally malachite. Grab sample 50339c, taken from an adit dump in 1983, yielded 252.9 grams per tonne silver, 3.57 grams per tonne gold, 1.2 per cent copper, 0.21 per cent zinc and 0.04 per cent lead (Assessment Report 12734).

Bibliography
EMPR AR 1918-K220; 1925-202; 1935-D14,G52; 1947-A154; 1948-A126
EMPR ASS RPT *12734
EMPR EXPL 1983-41,42
EMPR OF 1989-5
GSC MEM *79
GSC OF 481; 637; 1505A; 1565; 1969
GSC P 37-21
CJES Vol. 19, No. 6, pp. 1264-1274, 1984
Watson, P.H. (1981): Genesis and Zoning of Silver-Gold Veins in the Beaverdell Area, south-central British Columbia, M.Sc. Thesis, University of British Columbia, 156 pp.

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