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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  13-Nov-2024 by Del Ferguson (DF)

Summary Help Help

NMI
Name BIRKENHEAD, HELL CREEK Mining Division Lillooet
BCGS Map 092J089
Status Past Producer NTS Map 092J16W
Latitude 050º 49' 30'' UTM 10 (NAD 83)
Longitude 122º 16' 20'' Northing 5630617
Easting 551259
Commodities Jade/Nephrite, Talc, Gemstones Deposit Types Q01 : Jade
Tectonic Belt Coast Crystalline Terrane Bridge River, Methow
Capsule Geology

Jade outcrops at the head of Hell Creek, a northeastern flowing tributary of Bridge River, 28 kilometres west-northwest of Lillooet.

A mass of nephrite is fault bounded by serpentinite of the Permian and older Shulaps Ultramafic Complex on the west and by slightly metamorphosed argillaceous sediments of the Mississippian to Jurassic Bridge River Complex on the east. The tabular shaped mass is 2.4 metres wide in a 30 to 50 metre wide band of serpentinized ultramafic rocks trending northwest for approximately 900 metres to where it is cut by a granitic intrusion. The deposit dips 75 degrees south. The east contact is bordered by a talc zone 0.3 metre wide. Cross fractures pervade the nephrite, trending 065 degrees and plunging 70 degrees southeast. The nephrite is described as good to fair quality, the quality being decreased by the presence of coarse tremolite patches, talc and opaque minerals.

In 1966, E. Osterland extracted a few hundred kilograms of jade from the main showing. The deposit was held and quarried by Oscar Messeser of B.C. Gem Supply Ltd. and operated by Birkenhead Jade Mines Ltd. in the early 1970's. Approximately 150 metres of trenching and 550 m2 of stripping was done in 1970; 300 metres of trenching and 46 m2 of stripping in 1971; and 18,580 m2 of stripping in 1972. Birkenhead Jade produced 100 tonnes of nephrite in 1973.

The area was prospected and chip sampled by Kerr Addison Mines Ltd. in 1986, targeting the volcanic rocks and Eocene intrusives (Assessment Report 14895).

D. Deering and partners began mapping and prospecting the area in 2013 and 2014, targeting the jade sources. Road access was re-established and an environmental assessment and subsequent reclamation programs conducted. A new westerly jade pod was discovered in 2015, following up on a ground magnetometer survey target. Drilling (72.7 metres) was accomplished in 2018 and minor drilling and jade sampling was done in 2022.

Bibliography
EMPR ASS RPT 14895, 34905, 35320, 36237, 38113, 41110
EMPR BULL 32 (Map)
EMPR FIELDWORK 1974, p. 35; 1985, pp. 303-310; 1986, pp. 23-29; 1987,
pp. 93-130; 1988. pp. 105-152; 1989, pp. 45-72; *1990, pp. 75-83
EMPR GEM 1970-499; 1971-464; 1972-598; 1973-547
EMPR OF 1987-11; 1988-3; 1989-4; 1990-10
EMPR PFD 802125, 520280
GSC P *72-53, pp. 43, 44; *78-19

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