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File Created: 16-Jul-1991 by Garry J. Payie (GJP)
Last Edit:  12-Mar-2018 by Karl A. Flower (KAF)

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NMI
Name STAR MOUNTAIN, X-CAL, PASS Mining Division Lillooet
BCGS Map 092J068
Status Showing NTS Map 092J10E
Latitude 050º 39' 49'' UTM 10 (NAD 83)
Longitude 122º 32' 07'' Northing 5612521
Easting 532845
Commodities Gold, Nickel, Chromium Deposit Types I01 : Au-quartz veins
M03 : Podiform chromite
M02 : Tholeiitic intrusion-hosted Ni-Cu
Tectonic Belt Coast Crystalline Terrane Bridge River
Capsule Geology

The Star Mountain occurrence is located 8 kilometres west of Anderson Lake and 5 kilometres north east of Prospector Peaks.

In the region of the Star Mountain showing, the Cadwallader and Ferguson faults transect sedimentary and volcanic rocks of the Mississippian to Jurassic Bridge River Complex and the Upper Triassic Cadwallader Group. Linear, altered serpentinite zones called the President Ultramafics, correlative with the Permian and older Shulaps Ultramafic Complex, mark faults that have controlled the emplacement of diorite of the Permian Bralorne Igneous Complex. The above sequence lies between bodies of the Jurassic to Cretaceous Coast Plutonic Complex and outlying bodies of Cretaceous to Tertiary Bendor pluton granodiorite.

The occurrence is apparently underlain by ankerite-altered ultramafic rocks (listwanite?) of the President Ultramafics, correlative with the Shulaps Ultramafic Complex. The occurrence consists of a 20-centimetre wide quartz vein related to a feldspar porphyry dike.

In 1989, a sample from the vein assayed 1.55 grams per tonne gold (Assessment Report 19604).

In 1991, prospecting and sampling by Cogema Canada Ltd. 1.8 kilometres northeast of the Star Mountain showing and 2.4 kilometres south-southwest of the Prospector Peaks (MINFILE 092JNE159) showing revealed anomalous nickel and chromium values from sheared, pyritic (quartz?)-carbonate altered ultramafic rocks. Sample 114R yielded 0.13 per cent nickel and 0.13 per cent chromium (Assessment Report 22120).

Approximately 3.2 kilometres northwest of the Star Mountain occurrence, grab samples 096R and 097R yielded 0.93 and 0.91 gram per tonne gold, respectively (Assessment Report 22120). The samples were taken from a 0.20-metre wide quartz vein in siltstone adjacent to feldspar porphyry.

In 1980, Du Pont completed a program of rock, silt and soil sampling on the area as the Pass claim. In 1983, X-Cal Resources completed a program of rock and silt sampling and geological mapping on the area as the Mac and X-Cal claims. In 1985, Hudson Bay Exploration and Development completed a program of geochemical sampling, geological mapping and a ground electromagnetic survey. In 1989 and 1990, Teck completed programs of rock, silt and soil sampling, geological mapping and a ground electromagnetic survey on the area. In 1991, Cogema completed a program of geochemical sampling and geological mapping on the area.

Bibliography
EMPR ASS RPT 9257, 11749, 11876, 14382, *19604, *22120
EMPR FIELDWORK 1987, pp. 93-130; 1988, pp. 105-152; 1989, pp. 45-72
EMPR OF 1988-3; 1989-4; 1990-10
GSC OF 482

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