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File Created: 25-Apr-1987 by Peter B. Reid (PBR)
Last Edit:  08-Feb-1992 by Peter S. Fischl (PSF)

Summary Help Help

NMI
Name TULAMEEN BENTONITE (L.987) Mining Division Similkameen
BCGS Map 092H048
Status Showing NTS Map 092H07E
Latitude 049º 26' 33'' UTM 10 (NAD 83)
Longitude 120º 34' 05'' Northing 5479492
Easting 676289
Commodities Bentonite Deposit Types E06 : Bentonite
Tectonic Belt Intermontane Terrane Quesnel, Overlap Assemblage
Capsule Geology

The Tulameen Bentonite showing outcrops in a freshly exposed roadcut on Lot 987, 500 metres southwest of the Tulameen River and 4.5 kilometres west-southwest of Princeton.

The deposit is situated near the western margin of the Princeton Basin, a northerly striking fault-bounded trough filled by Eocene volcanic rocks of mainly intermediate composition, comprising the Lower Volcanic Formation, and an overlying Eocene sedimentary sequence of sandstone, shale, waterlain rhyolite tephra (tuff) and coal, up to 2000 metres thick, comprising the Allenby Formation.

The showing is hosted in a sequence of shale and carbonaceous shale, known informally as the Vermillion Bluffs shale, in the Allenby Formation (Princeton Group) (Open File 1987-19). The deposit consists of a 1 to 2-metre thick bentonite seam comprised of calcium-rich montmorillonite. The bed strikes 126 degrees and dips 26 degrees southwest.

Exchangeable cation analyses and cation exchange capacity (CEC) in milli-equivalents per 100 grams on one sample are as follows (Open File 1987-19):

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Sample Magnesium Calcium Potassium Sodium CEC

C86-370 15.6 51.3 0.1 1.4 63.7

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Bibliography
EMPR FIELDWORK 1986, pp. 247-254
EMPR OF *1987-19
EMPR P 1983-3
GSC MAP 888A; 1386A; 41-1989
GSC MEM 243
GSC P 85-1A, pp. 349-358

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