The Chief Southwest occurrence is located approximately 25 kilometres south of the Yukon-British Columbia border, near Alec Chief Creek, about 101 kilometres north of the community of Dease Lake.

The showing is hosted in Upper Devonian-Lower Mississippian Earn Group clastics (silt-laminated sandstone) and consists of thin bedded siliceous exhalite with very fine grained barite and fine grained layers of pyrite.

A very large boulder across the creek contains semi-massive pyrrhotite-pyrite with crosscutting quartz-chalcopyrite.

In 1981, Regional Resources Ltd. staked the Chief property to protect base metal stream sediment and soil anomalies and the probable source of massive sulphide float boulders located during reconnaissance prospecting. Additional staking was undertaken in July 1982 to cover a 7 kilometre airborne geophysical anomaly and a new showing of stratiform barite. Work completed to date (1982) includes geological mapping, geochemical soil sampling (2369 samples), prospecting, line cutting (12 kilometres) and a combined airborne electromagnetic, resistivity and magnetometer survey (Dighem II system). During the 1984 field season, work included grid preparation, geochemical soil sampling, hand trenching and a proton magnetometer survey.