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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  24-Feb-89 by David G. Bailey(DGB)

Summary HelpHelp

NMI
Name LONGWORTH, NONDA QUARTZITE, SNOW, RAIN, LONG, DOLL Mining Division Cariboo
BCGS Map 093H093
Status Prospect NTS Map 093H14W
Latitude 53º 58' 48" N UTM 10 (NAD 83)
Longitude 121º 29' 30" W Northing 5982350
Easting 598914
Commodities Silica Deposit Types R07 : Silica sandstone
Tectonic Belt Foreland Terrane Ancestral North America
Capsule Geology

The Longworth prospect is located about 80 kilometres east of Prince George. The claims were staked originally in 1974 and blasting, trenching and sampling has been completed on the property

The prospect is hosted by a folded sequence of sedimentary and volcanic rocks which underlie Bearspaw Ridge. They are all, or in part, Lower Silurian in age and equivalent to the Nonda Formation.

At least four northwest trending bands of quartzite have been mapped along the western flank of Bearpaw Ridge. Thicknesses reach up to about 400 metres. The main quartzite band outlines a synformal structure open to the northwest. Rare bedding observed in outcrop dips 70 to 80 degrees east. The quartzite is very pure, massive and homogeneous. It is composed of extremely well-rounded and well- sorted quartz grains, averaging 0.5 millimetre in diameter, which are cemented by silica. The quartzite is pinkish white to buff on fresh surfaces and weathers grey to white. Impurities include muscovite in cavities, limonite on microfractures, minor calcite and possible hydrocarbons. Eight chip samples collected in 1982 by the Geological Survey Branch averaged 99.5 per cent silica (Open File 1987-15).

Consolidated Silver Standard Mines Ltd. evaluated the property in 1985 for the production of ferrosilicon and silicon metal. They took 42 samples of which 28 had the required chemical specifications, SiO2 was from 98.84 to 99.80 per cent and 16 samples had acceptable thermal shock results (Open File 1987-15).

Bibliography
EMPR AR 1965-274
EMPR FIELDWORK 1982, p. 196
EMPR ASS RPT *14815
EMPR OF 1987-15, pp. 13-15
EMPR PF (Consolidated Silver Standard Mines Ltd. Annual Report 1988)
EMPR EXPL 1986-C342,343
GSC P 72-35, p. 89
GSC MAP 1424A

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