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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  24-Jan-2014 by Karl A. Flower (KAF)

Summary Help Help

NMI 092L7 Cu1
Name ALPHA 4 (NIMPKISH COPPER), ALPHA ZINC, KINMAN Mining Division Nanaimo
BCGS Map 092L036
Status Showing NTS Map 092L07W
Latitude 050º 20' 04'' UTM 09 (NAD 83)
Longitude 126º 50' 06'' Northing 5578058
Easting 654073
Commodities Zinc, Copper Deposit Types
Tectonic Belt Insular Terrane Wrangell, Plutonic Rocks
Capsule Geology

The Alpha 4 occurrence is located on a south west facing ridge, north east of Kinsman Creek and approximately 7 kilometres east- south east of the creek mouth.

North striking Upper Triassic Vancouver Group carbonates of the Quatsino Formation overlie Karmutsen Formation tholeiitic basalts. Lower Jurassic Bonanza Group volcanics are coeval with, or genetically related to granodiorite of the Nimpkish batholith of the Jurassic Island Plutonic Suite. Strong regional north to northwest trending faults, often defining intrusive and lithological contacts, traverse the area.

Locally, a 9 by 3.6 metre long massive pyrrhotite lens lying along a northeast trending steep mafic porphyry dike in granodiorite, 60 metres from its contact with Quatsino lime- stone. The lens contains pyrrhotite, considerable zinc and minor copper.

Four samples assayed from 4.3 to 9.6 per cent zinc and up to 0.38 per cent copper, with only a trace of silver and gold (Geological Survey of Canada Summary Report 1931A, page 27).

In 1966, Empire Development completed a program of ground geophysical surveys and geological mapping on the area as the Alpha, Hazel and Pie claims, Kinman property. In 1998 and 1999, Doublestar Resources completed programs of prospecting and ground geophysical surveys on the area as the 2Star claim group. In 2008, Homegold Resources completed a program of rock and soil sampling, geological mapping and prospecting on the area as the Bonanza 1 claim.

Bibliography
EMPR AR 1928-379; 1929-381; 1930-299; 1965-230; 1966-68
EMPR ASS RPT 456, *831, 832, 3749, 25764, 26174, 30477
EMPR GEM 1970-273
GSC ANN RPT 1886
GSC BULL 242
GSC MAP 4-1974; 255A; 1029A; 1552A
GSC MEM 272
GSC OF 9; 170; 463
GSC P 38-2; 38-3; 72-44; *74-8
GSC SUM RPT *1929A; 1931A, p. 27
CJES 18, p. 1; 20, p. 1 (1983)
Alsen, J.B., (1975): A Magnetite Skarn Deposit near Bonanza Lake,
unpubl. B.Sc. Thesis, University of British Columbia
Carson, D.J.T., (1968): Metallogenic Study of Vancouver Island with
emphasis on the Relationship of Plutonic Rocks to Mineral Deposits,
Ph.D. Thesis, Carleton University, Ottawa
Sangster, D.F., (1964): The Contact Metasomatic Magnetite Deposits
of Southwestern British Columbia, Ph.D. Thesis, University of
British Columbia

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