The Perry Barite showing is located 3 kilometres south of the British Columbia-Yukon border, about 80.5 kilometres north-northwest of Cassiar. This deposit is 2.2 kilometres south-southeast of and on strike with the Ewen Barite prospect (104O 050).

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 pure, bedded barite exhalite occurs in siltstone of the Earn Group. The deposit is folded about a northwest-trending syncline that is truncated by a shallow dipping thrust fault. The horizon is exposed over a length of 350 metres and averages 11 metres thick. A series of continuous chip samples taken across bedding averaged 90.35 per cent BaSO4 (Assessment Report 11020, page 52).

The deposit was geologically mapped and sampled by Amax of Canada Ltd. in 1981 and 1982, while under option from Regional Resources Ltd.