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):

________________________________________________________________

Sample Magnesium Calcium Potassium Sodium CEC

C86-370 15.6 51.3 0.1 1.4 63.7

________________________________________________________________