The Rat occurrence is located between Camper and Coal creeks, approximately 7.5 kilometres north west of Port Renfrew.

The area is underlain by andesite/basalt flows and sills with minor cherts and shales, of the Jurassic to Cretaceous Leech River Complex. The strata is intruded by diorite related to the Mesozoic and/or Paleozoic Westcoast Complex.

An 18 metre long altered band of outcrop, about 1 metre wide, occurs below a layer of pyritized andesite. The altered material consists of chlorite, clay, zeolites and silica.

In 1988 and 1989, programs of rock sampling, geological mapping and a ground magnetometer survey was completed on the area as the Rat 1-6 claims. A sample of the altered outcrop assayed 0.81 grams per tonne gold (Assessment Report 18047).

The shale/chert sediments and the andesitic volcanics all contain high amounts of mercury, up to 0.4 per cent (Assessment Report 18047).