The Fraser Gulch zeolite showing outcrops in the headwaters of Fraser Gulch, 3.5 kilometres west of Coalmont and 3.5 kilometres south-southeast of Tulameen.

The deposit occurs near the northeastern margin of the Tulameen Basin. This structural basin is comprised of a northwest-trending syncline that preserves a sequence of sedimentary rocks with lesser intercalated volcanics of the Eocene Allenby Formation (Princeton Group), up to 840 metres thick. The sequence rests unconformably on a basement of Upper Triassic Nicola Group metamorphosed volcanics and sediments.

The prospect is hosted in a sequence of sandstone and shale, with minor coal, known informally as the Summers Creek sandstone (Open File 1987-19). The zeolitic horizon is contained entirely in a section of sandstone and granule conglomerate.

The deposit is comprised of a heulandite-clinoptilolite rich vitric crystal (biotite, quartz, feldspar) waterlain tuff that strikes 106 degrees and dips 54 degrees southwest. The bed is at least 3 metres thick and can be followed along strike for 100 metres. 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

C86-391N 4.5 35.0 29.3 0.7 84.8

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