The Lewis occurrence is located at an elevation of approximately 660 metres on a southwest-facing slope, northeast of Lewis Lake and approximately 3.4 kilometres east-southeast of Tin Hat Mountain.

The area is underlain by Mesozoic diorite of the Coast Plutonic Complex, which has been intruded by a 500-metre-wide quartz diorite phase of the same age. Northeast- and northwest-striking andesite dikes cut the intrusive rocks.

Mineralization is present in three locations—the Central zone and the East and South zones, located 250 metres east and southwest of the Central zone, respectively. Mineralization consists of disseminated and fracture-filling chalcopyrite in the Central zone, and chalcopyrite with molybdenite in the East and South zones. Disseminated pyrite and magnetite are reported near the andesite dikes. Chlorite alteration is pervasive along with secondary biotite in a north-northeast-striking zone of shearing that projects through the area of mineralization. Alaskite dikes up to 1 metre wide occur near the shear zone.

Maximum values of 0.74 per cent copper over 1.8 metres and 0.026 per cent molybdenite over 1.5 metres have been reported, but the average value from all trenches was 0.12 per cent copper (Assessment Report 9948, page 3).

Work History

In 1975, the Redonda Syndicate completed a program of geological mapping, soil sampling and trenching on the area as the Lewis, Clark and Canoe claims. In 1978, Asarco Exploration Co. of Canada Ltd. completed a program of geochemical (rock and soil) sampling and test pitting on the Lewis and Clark claims.

In 1981, Tech Explorations completed a geological mapping program on the area as the Beach claim.

In 2017, Straightup Resources Inc. completed a program of geochemical (rock and soil) sampling on the area as the Hi-Mars property. A rock sample (No. 49) assayed 0.555 per cent copper (Straightup Resources Inc. (2018-06-24): Technical Report, Hi-Mars Mineral Property, Southwest British Columbia, Canada).