This showing is on the abandoned Copper Mountain railway grade, 5.5 kilometres south-southwest of Princeton.

The deposit is situated near the eastern 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 shale member in the upper part of the Allenby Formation (Princeton Group), known informally as the Ashnola shale (Open File 1987-19). A pit on the east side of the railway exposes a 4.9-metre thick section of bentonitic siltstone, shale and bentonite, overlain by 1 metre of fine sandstone and underlain by 1 metre of carbonaceous shale. The beds strike 068 degrees and dip 21 degrees southeast.

The bentonitic horizons contain sodium-rich montmorillonite. Exchangeable cation analyses and cation exchange capacity (CEC) in milli-equivalents per 100 grams on two samples of bentonitic siltstone and shale are as follows (Open File 1987-19):

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Sample Magnesium Calcium Potassium Sodium CEC

C86-348A 6.7 11.3 1.3 22.3 68.5

C86-348B 6.2 8.9 1.5 23.5 40.5

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The area is held as the Bud claims by Western Industrial Clay Products Ltd. A 6000 to 7000-tonne bulk sample was taken in 1998.