The Bromley Creek Zeolite showing is exposed in an old gravel pit, 350 metres northeast of Bromley Creek, 100 metres southeast of Highway 3 and 5.5 kilometres southwest of Princeton.

The occurrence is situated near the centre of the Princeton Basin, a northerly trending 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 gravel pit contains blocks of rounded to angular zeolite, weighing 3 to 5 tonnes each. This material is likely derived from the same zeolitized, waterlain rhyolite crystal-vitric tuff, which hosts the Highway 3 occurrence (092HSE165), 800 metres northeast. The unit is in the upper part of the Allenby Formation (Princeton Group) and is known informally as the Tailings ash. Clinoptilolite content (in per cent) and cation exchange capacity (in milli- equivalents per 100 grams) for two samples are as follows (Property File - V. Marcille-Kerslake, 1992):

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  Sample          Clinoptilolite      CEC
    1                 60.93          134.05
    2                 46.18          101.60
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Sample 2 was taken at surface.

The showing was bulk sampled by Ray Marks in 1991.

Heemskirk Canada Ltd. operates the quarry.

See Zeo (MINFILE 092HSE166) occurrence for further information on the Bromley Creek zeolite occurrences.