The Ewen Barite prospect is situated 1000 metres south of the British Columbia-Yukon border, about 82 kilometres north-northwest of Cassiar.

This area, between the Tootsie River and Big Creek near the Yukon border, is underlain by a turbiditic sequence of slate, siltstone, sandstone and chert-pebble conglomerate of the Upper Devonian to Lower Mississippian Earn Group, which unconformably overlies platformal carbonates of the Middle-Upper Devonian McDame Group. Siliceous to baritic exhalites tend to be found in this area within the Earn Group.

A stratiform sedimentary exhalative barite horizon strikes 155 degrees for about 200 metres within Earn Group sediments and dips approximately 24 degrees southwest along a dip slope. The horizon is underlain by siliceous black argillite, overlain by siltstone and is truncated by a fault to the north. The deposit is 70 metres wide and has an average thickness of 7 metres.

The barite is fine grained, light grey to white and moderately to poorly laminated to lenticular. Pods and nodules of medium grey limestone and limonite are locally present. Fine sericitic partings are common. The deposit is estimated to contain 181,000 tonnes of easily accessible, high-quality barite grading 89 per cent BaSO4 over a strike length of 130 metres (Assessment Report 11020, page 51). Specific gravities of the barite averaged around 4.2 grams per cubic centimetre (Assessment Report 11020, page 20).

The deposit was geologically mapped, sampled and drilled (4 holes totalling 29.6 metres) by Amax of Canada Ltd. in 1981 and 1982, while under option from Regional Resources Ltd.