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File Created: 09-Mar-92 by William H. Halleran(WHH)
Last Edit:  12-Apr-92 by William H. Halleran(WHH)

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NMI
Name GRAYLING CREEK Mining Division Liard
BCGS Map 094F100
Status Showing NTS Map 094F16E
Latitude 57º 57' 50" N UTM 10 (NAD 83)
Longitude 124º 05' 23" W Northing 6425210
Easting 435524
Commodities Copper, Silver Deposit Types I06 : Cu+/-Ag quartz veins
Tectonic Belt Foreland Terrane Ancestral North America
Capsule Geology

The Grayling Creek showing occurs at two locations in Grayling Creek valley, at an elevation of 1410 metres on the west side and 1675 metres on the east side of the valley. The valley and surrounding slopes are underlain by Cambrian to Silurian platformal sequence of carbonates, quartzites and siltstones. Lower Cambrian Atan Group dolomites and quartzites, intruded by mafic dykes, are conformably overlain by a sequence of Cambrian to Ordovician Kechika Group arenaceous dolomites and limestones and Silurian Nonda Formation siltstones.

Mineralization occurs at the same stratigraphic level on both sides of the valley, at the top of the Atan Group immediately below the Kechika Group. The showings consist of irregular pods, open space-fillings, and veins of massive pyrite, bornite, chalcopyrite and tetrahedrite in silicified fractured dolomite. Fractures are completely healed by crystalline calcite. A composite chip sample of massive sulphide mineralization graded 1.4 per cent copper and 10.2 grams per tonne silver (Assessment Report 21437).

Bibliography
EMPR GEM 1970-62; 1971-72,75
EMPR ASS RPT *12594, *19124, *21437
GSC OF 606
GSC P 79-1A, p. 228

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