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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  22-Jan-1988 by Laura L. Coughlan (LLC)

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NMI 092H3 Ni1
Name MAMMOTH, FOUNDATION MINES, FORKS, BIG BEN, STAR, DIAMOND, RUBY, HEART, BB, DEFIANCE Mining Division New Westminster
BCGS Map 092H025
Status Prospect NTS Map 092H03E
Latitude 049º 13' 14'' UTM 10 (NAD 83)
Longitude 121º 05' 19'' Northing 5453733
Easting 639182
Commodities Nickel, Silver, Gold, Copper, Tungsten, Molybdenum Deposit Types K : SKARN
M05 : Alaskan-type Pt+/-Os+/-Rh+/-Ir
Tectonic Belt Coast Crystalline Terrane Bridge River
Capsule Geology

The north-northwest trending Hozameen fault separates the low greenschist facies rocks of the Permian to Jurassic Hozameen Complex on the west, from Lower-Middle Jurassic Ladner Group sediments to the east. A Late Cretaceous quartz diorite stock intrudes the sediments along the east side of the fault. Pyroxenite dikes and minor ultramafic pods intrude the Hozameen greenstones.

The showings are west of the Hozameen fault and are underlain by rocks of the Hozameen Complex, comprised mainly of greenstone, volcanic chert, argillite and limestone. The regionally metamorphosed rocks generally contain fine-grained actinolite, epidote, chlorite and locally prehnite. Limestone is interbedded with the greenstone.

The main deposit occurs in a belt about 15 metres wide within altered limestone. The lime silicate rocks hosts scheelite in a vein about 0.9 metre along the west wall of the lime belt. Associated with the scheelite is a considerable amount of nickeliferous pyrrhotite. Of the lime silicate minerals, anorthite occurs in coarsely crystalline masses associated with the scheelite and clusters of green, fibrous actinolite. Other minerals consist of dark sphalerite, pyrolusite and molybdenite.

The east wall of the lime silicate belt is comprised of an intimate mixture of quartz and calcite with intergrowths of siderite. A considerable amount of pyrrhotite and sphalerite is disseminated throughout the carbonate vein.

Other small orebodies consist of a mixture of pyrrhotite, pyrite, arsenopyrite, chalcopyrite and some magnetite. These occur as pods or disseminations in a gangue of quartz and lime silicate minerals consisting of epidote, hornblende, pyroxene, wollastonite, strontianite and garnet.

In 1961, a sample taken from an opencut in the main deposit analysed 0.34 gram per tonne gold, 27.43 grams per tonne silver, 0.25 per cent copper and 0.7 per cent nickel (Prospectus and Mining Record for Foundation Mines Ltd.).

Bibliography
EMPR AR 1920-171; 1923-164; 1927-210; 1929-241; 1938-F4,F21; 1955-74; 1962-89,90; 1964-137; 1965-213
EMPR BULL 10 (Revised), p. 116
EMPR OF 1991-17
EMPR PF (Prospectus and Mining Reports with Diamond Drill Sections for Foundations Mines Ltd.; Unpublished Report on Foundation Mines Ltd. by R.J. MacKinnon; claim maps and plan maps)
EMR MP CORPFILE (Foundation Mines Ltd.)
GSC BULL 238
GSC MAP 12-1969; 737A
GSC P 69-47, p. 62
GSC SUM RPT 1911, p. 120,121; *1920A, p. 40; *1922A, p. 121, Fig.11
EMPR PFD 8312, 9059, 9060, 509459, 509460

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