The Sunday Creek zeolite showing outcrops along Sunday Creek and Highway 3, approximately 24 kilometres south-southwest of Princeton.

The deposit lies near the south end 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 consists of a zeolitized, waterlain rhyolite crystal-vitric lapilli tuff in the basal 100 metres of the Allenby Formation (Princeton Group). The tuff outcrops over a distance of 500 metres along the west side of Highway 3, in a 5-metre-high roadcut south of Sunday Creek. Several exposures also occur in Sunday Creek just east of the highway. One of these exposures, 100 metres east of the highway, is comprised of a section of zeolitized tuff at least 30 metres thick, overlain by sandstone and underlain by volcanic pebble to cobble conglomerate. This sequence is folded into a gently north-plunging syncline. The tuff outcrops along the west flank of the syncline over a total strike length of 1300 metres.

Zeolite mineralization consists of high-quality clinoptilolite, together with cristobalite, sanadine, plagioclase, quartz and biotite. Exchangeable cation analyses and cation exchange capacity (CEC) in milli-equivalents per 100 grams on two samples are as follows (Open File 1987-19):

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Sample Magnesium Calcium Potassium Sodium CEC

Z8 5.5 34.3 16.1 11.8 75.6

Z9 6.7 31.9 18.6 4.7 62.7

Sample Z8 is a grab sample from the roadcut along Highway 3, while

sample Z9 is a composite chip sample taken across the 30-metre thick

section of tuff on Sunday Creek, 100 metres east of Highway 3.

In 1994, Canmark International Resources Inc. completed a 10-hole drill program that, combined with a 10-hole program the previous year, proved reserves of 4.5 million tonnes at an average cation exchange capacity of 116 ranging from 95 to 135, with a cut-off grade of 100. Indicated reserves are 8 million tonnes, with 28 million tonnes based on geologic considerations (PF 888313).

Also in 1994, Phoenix Engineering Ltd. completed a reserve estimate and mine feasibility review on behalf of Canmark. Measured reserves of clinoptilolite with an average cation exchange capacity grading 116 were 3.5 million tonnes, with 4.4 million tonnes indicated and 38.6 million tonnes inferred. The reserves occur in a 10 to 15-metre-thick zone. A 10-year mine life was assessed based on 4 million tonnes of reserves and an open-pit mining style (Assessment Report 23457).

In the spring of 1995, a 20-year mine and reclamation plan was approved and a Mine Development Certificate was granted (Information Circular 1996-1).

In 1995, Canmark International Resources Inc. mined a 10 000-tonne bulk sample for market development in the Lower Mainland. Canmark signed a contract with Sun-Ray Resources Ltd. to supply 2000 tonnes of zeolite with an option for an additional 3000 tonnes within a year (Information Circular 1995-9, page 19).

In 1997, Canmark reactivated a 10 000-tonne bulk sample permit, with 51 tonnes intended for sale to Cominco Alaska for environmental reclamation (Property File 886518).

In 2001, Canmark completed seven drill holes, totalling 408.1 metres. Two of the holes, 04-01 and 05-01, intercepted zeolite over 6.1 and 15.3 metres, respectively (Carpenter, T.H. (2018-06-30): Technical Report on the Sun Group Property with Recommendations for Further Exploration).

In 2012, CMC completed ten drill holes, totalling 605 metres. Seven of the holes intercepted zeolite over widths of 9.0 to 25 metres with CEC grades ranging from 63 to 130 (Carpenter, T.H. (2018-06-30): Technical Report on the Sun Group Property with Recommendations for Further Exploration).