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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  12-Jun-2007 by Sarah Meredith-Jones (SMJ)

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NMI 092I9 Cu11
Name ADMIRAL DEWEY (L.1561), CYCLONE (L.1562), BLACK BEAUTY (L.1560), DEWEY, PAIN, ACE, REG Mining Division Kamloops
BCGS Map 092I059
Status Prospect NTS Map 092I09W
Latitude 050º 35' 20'' UTM 10 (NAD 83)
Longitude 120º 19' 36'' Northing 5607521
Easting 689226
Commodities Copper, Gold, Silver Deposit Types L03 : Alkalic porphyry Cu-Au
Tectonic Belt Intermontane Terrane Quesnel
Capsule Geology

The Admiral Dewey showing is located on the Grandview Ski Hill site about 9 kilometres south of Kamloops. The area is underlain by Cherry Creek unit monzonite and Sugarloaf unit hornblende diorite of the Late Triassic-Early Jurassic Iron Mask batholith. The Admiral Dewey workings were inaccessible in the early 1940s and an adit reported to be 26 metres long is caved at the portal, and a shallow shaft was partly filled with water. Minister of Mines Annual Reports stated there is a vein 0.9 to 1.2 metres wide mineralized with chalcopyrite and carrying low values in gold. From dump material it appears that the hostrock is diorite and the ore carries a little quartz, chalcopyrite, azurite and malachite. A sample of picked ore is stated to have assayed 2.7 grams per tonne gold and 13.7 grams per tonne silver (Geological Survey of Canada Memoir 249).

Mineralization on the property is generally localized in zones of intense fracturing and alteration in monzonite and intrusive breccia. Pyrite is the predominant sulphide mineral and occurs as fine fracture fillings and as disseminations. Chalcopyrite occurs mainly as disseminations and fine fracture coatings. Local concentrations of magnetite also occurs. Malachite and lesser azurite are widespread and occur in practically every old cut, trench and adit on the property. Chlorite, epidote, albite, K-feldpar, quartz and carbonate are the most commonly observed alteration minerals. Alteration on the property is generally moderate to intense in the immediate vicinity of mineralization.

An induced polarization anomaly 350 by 350 metres in area has been tested by percussion drilling which intersected scattered intersections of interesting copper mineralization in fractured Cherry Creek unit monzonite. In 1979, fourteen percussion-drill holes were put down south of the Admiral Dewey Crown grant on the adjoining Black Beauty Crown grant. Three holes intersected pyritic diorite to monzonite intrusive rocks sparsely mineralized with disseminated chalcopyrite; minor magnetite also occurs. Drillhole 79-3 intersected 7.9 metres grading 0.33 per cent copper, drillhole 79-8 intersected 9.1 metres grading 0.41 per cent copper and drillhole 79-10 intersected 3.1 metres grading 0.31 per cent copper (Assessment Report 8038). The most significant copper mineralization is hosted in the monzonite. Alteration consists of slight chloritization of mafic minerals in the intrusive rocks. In 1989, a percussion-drill hole near the Admiral Dewey adit intersected 57.9 metres grading 0.11 per cent copper including 18 metres grading 0.19 per cent copper and 3 metres grading 0.34 per cent copper (Assessment Report 21468).

In 1969, Great Plains Development Company of Canada Ltd. conducted geological mapping, soil sampling (290), 8.8 kilometres of ground magnetometer survey and 44.4 kilometres of induced polarization survey on the Byr and Ace No. 1 claim group which also covered the Fargo (092INE051) and B (092INE118) showings. In 1978, Cominco Ltd. completed 6.6 kilometres of induced polarization and magnetometer survey over the And and Lark claims which just cover the south portion of the Admiral Dewey property. In 1978, Cominco Ltd. drilled seven percussion-drill holes totalling 488 metres on the Reg and Ace claims on behalf of Great Plains Development Company of Canada Ltd. and 4.5 line kilometres of induced polarization and ground magnetometer survey over the Reg and Byr claims. Also in 1978, Cominco Ltd. drilled five vertical percussion-drill holes totalling 382 metres on the Black Beauty Crown grant (Lot 1560) which adjoins the Admiral Dewey Crown grant to the south. Short intersections of copper grades normally considered significant in a porphyry environment were intersected in most of the drillholes. In 1979, Cominco Ltd. drilled 14 vertical percussion-drill holes totalling 829 metres on the Reg and Ace claims. Several drillholes intersected copper mineralization. In 1980, Cominco Ltd. drilled thirteen vertical percussion-drill holes totalling 1079 metres on the Reg property which covers the Crown grants. In 1989, Cominco Ltd. drilled 41 percussion-drill holes totalling 3507 metres on the Edith property which covers the Fargo, B and Admiral Dewey showings. In 1991, Cominco Ltd. drilled four percussion-drill holes totalling 359 metres on the Ace and Reg claims.

EMPR AR 1898-1103; 1899-731; 1901-1078; 1904-G230; 1956-47-54,Fig.3
EMPR ASS RPT 2143, 2144, 6739, 6767, 6803, *6860, *8038, 8127
*11838, *18873, 21468
EMPR EXPL 1978-E167; 1979-174,175
EMPR GEM 1969-236,237
EMPR PF (Soil sample survey map, 1970)
GSC MEM *249, p. 114
GSC OF 165; 980; 2490
GSC MAP 886A; 887A; 9-1963; 1394A; 42-1989
GSC P 44-20; 82-1A, pp. 293-297; 85-1A, pp. 349-358
EMPR PFD 9760, 810691