The RB (Mount Bertha) occurrence is located on a generally north-northwest–facing slope, north of the Sikanni Chief River and approximately 1.5 kilometres north-northwest of Mount Bertha.

Regionally, the area is underlain by a conformable package of Silurian Nonda Formation dolomite and sandstone, Lower Devonian Muncho-McConnell Formation dolomite, Lower to Middle Devonian Stone Formation dolomite and Middle Devonian Dunedin Formation limestone. This package is overthrust to the east onto Devonian to Carboniferous Besa River Formation shale.

Locally, calcite and calcite-barite mineralization, hosted within Dunedin limestone, occurs in various localities as pods up to 75 by 30 metres in size, sheet-like veins and pipe-like masses with enclosed limestone blocks. Small galena showings with trace sphalerite are associated with the calcite/barite veins and pods. Composition of the pods and veins range from 100 per cent calcite to 50 per cent barite.

In 1972, rock sampling of the Mount Bertha area yielded: values of up to 3.26 and 1.1 per cent zinc from the north end of line 33 (approximate location of the RB occurrence); 2.65 and 1.1 per cent lead from the south end and central portions of line 26, respectively, which are located approximately 1 to 1.5 kilometres south-southwest of the plotted location of the occurrence, and 80.0 and 37.0 grams per tonne silver from lines 28 and 18, located approximately 1 kilometre south and west of the plotted occurrence location, respectively (Assessment Report 4090). It is not known if these rock samples were from outcrop or talus.

Work History

In 1972, Canadian Superior Exploration Ltd. completed a program of geological mapping and geochemical (rock and soil) sampling on the area as the Dev, June and RB claims.