The RPM occurrence, a quartz-carbonate shear zone exposed in two trenches, is located 1.25 kilometres north-northwest of Mount Basnett, south of the Finlay River, about 320 kilometres north of the community of Smithers.

The regional geology consists of a northwest trending belt of rocks of the Lower Cambrian Atan Group and Cambrian to Ordovician Kechika Group within the Omineca Range and the Finlay River area. Limestone, phyllite, and calcareous shale comprise lithologies of the Kechika Group, and limestone, siltstone, dolomite, quartzite, shale, sandstone and conglomerate comprise the Atan Group. The general trend of these formations is 345 to 350 degrees with steep dips to the southwest. Contacts between units are fairly sharp.

The RPM showing is underlain by a dark band of laminated black slate in contact with limy rocks. The contact is gradational where the slates grade into unfoliated limestone. The slaty rocks strike 315 to 320 degrees and dip 60 to 75 degrees southwest. The finely laminated sequence exhibits some overturning. A major northwest striking fracture or shear zone has been traced for 914 to 1219 metres length, parallel to subparallel to a major quartz-ankerite zone. Shearing was observed mainly as quartz filling in fractures ranging from 0.91 to 7.62 metres in length. This quartz-ankerite zone effectively controls the horizontal extent of the mineralized structure.

Copper-quartz-carbonate mineralization occurs along a bedding contact, adjacent to a single continuous shear with an iron-rich matrix. Sulphides consist of chalcopyrite, pyrite and minor bornite with associated malachite and azurite. The exposed width in two trenches is about 67 centimetres. Trench 1 exposed a near bedding-parallel shear, dipping 75 degrees southwest, about 10 to 15 degrees steeper than bedding. Mineralization is evident 3 to 4.6 metres west of Trench 1 as a silicified zone. Trench 2, 457 metres southeast of Trench 1, exposes a shear zone 15 to 20 centimetres wide and dipping 35 degrees to the southwest.

In 1969, a sample (264501) from Trench 1 analyzed 1.32 per cent copper, 10.29 grams per tonne silver and 0.17 gram per tonne gold, over 66 centimetres width. Sample 264502 from Trench 2 analyzed 0.66 per cent copper, 13.7 grams per tonne silver and 0.17 gram per tonne gold (Assessment Report 2471).

In 1951-52, mineralized quartz veins on the Dolly (094E 219) and Bas claims located 1.7 kilometres northeast of the RPM showing were found by E. Bronlund. In 1968, Union Carbide held claims over the Dolly showings and in 1969 Highplain Exploration Ltd. held claims over mineralized shear zones along the Mount Basnett ridge. In 1969, a brief field study was conducted by C.E. Zimmerman on the RPM and REV group of claims accompanied by V. Strandberg and G. Barton of Highplain Exploration Ltd. The property examination was conducted fairly late in the season and much of the area was covered by snow which blanketed the upper area where the major mineral showings are located.

In 1980, Nolan Resources Ltd. acquired the Dolly and Bas claims and completed a combined helicopter-borne electromagnetic and magnetic survey that was flown over the Dolly claims and part of the Bas claims.