The Rodriga occurrence is located on the southern shore of the Marble River.

The area is underlain by northwest- trending volcanics and sediments of the Upper Triassic Vancouver Group (Karmutsen and Quatsino formations) and the Lower Jurassic Bonanza Group.

Locally, chalcopyrite occurs along fracture planes, in basalt flow tops and tuffs, and is commonly associated with calcite and quartz veins.

In 1993, Kennecott Canada completed a program of rock and soil sampling and geological mapping on the Marble Arch claims.