The area of the Rainbow 5 showing is underlain by andesitic to mafic volcanic rock of the Lower Jurassic Telkwa Formation, Hazelton Group. A stock of granodioritic quartz feldspar porphyry of the Late Cretaceous Bulkley Plutonic Suite intrudes the volcanic rock. The stock is known as the Sunsets stock.

A 10-metre wide zone of intense epidote-chlorite alteration occurs in a gossanous zone in andesite and contains poddy mineralization consisting of 10 to 15 per cent fine-grained pyrite, malachite staining and rare irregular feldspar veins to 1 centimetre. A grab sample of the poddy mineralization assayed 6 parts per billion gold, 2.2 grams per tonne silver, and 1.1 per cent copper (sample YR-22, Assessment Report 21765). The mineralized pod measured 30 by 30 centimetres on surface.

Refer to Loring (093L 036) and Fly (093L 045) for related details.

Refer also to King (093L 041) for general information on the El Toro property, a large property that was worked by of Lions Gate Energy Inc from 2007 to present (2015) and encompassed the Sunset Basin area which contains this showing.