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File Created: 07-May-1991 by Peter S. Fischl (PSF)
Last Edit:  14-Mar-1995 by Peter S. Fischl (PSF)

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Name JOSEPH LAKE Mining Division Omineca
BCGS Map 093K007
Status Prospect NTS Map 093K02E
Latitude 054º 00' 19'' UTM 10 (NAD 83)
Longitude 124º 39' 47'' Northing 5985389
Easting 391006
Commodities Vermiculite Deposit Types M08 : Vermiculite deposits
Tectonic Belt Intermontane Terrane Stikine, Plutonic Rocks
Capsule Geology

A vermiculite prospect outcrops 14 kilometres southeast of the community of Fraser Lake, in an area underlain by granite, granodiorite and quartz diorite of Jurassic age.

A road-cut exposes a zone of reddish orange weathered, medium grained granodiorite, 75 metres long, containing mica flakes which swell when heated with a propane torch. Fresh medium-grained granodiorite outcrops along a ridge immediately northeast of this zone. The granodiorite contains mica flakes, that also expand on heating, throughout much of the exposed area.

Exfoliation tests were carried out on a sample of vermiculite by CANMET, Energy, Mines and Resources Canada. Vermiculite content of the tested sample averaged 5.6 per cent (Fieldwork 1990, p. 267, Table 3-1-2). The material may be too fine-grained for use as loose insulation; 91 per cent of the vermiculite was found to occur in size fractions below 1.40 millimetres. Bulk densities of the minus 1.40 millimetre size fractions, ranged from 326 to 427 kilograms per cubic metre, above the ASTM range of 88 to 128 kilograms per cubic metres specified for loose insulation.

EMPR EXPL 1992-69-106
EMPR FIELDWORK *1989, pp. 481-487; *1990, pp. 265-268; 1992, pp. 475-482
GSC MAP 630A, 971A, 1424A
GSC OF 2593, 3182
GSC P 90-1F, pp. 115-120; 91-1A, pp. 7-13