The claims are situated on the intrusive contact of the Coast Plutonic Complex with Unuk River Formation volcaniclastic rocks. All of Gold Unuk 3 and 4 claims and the west half of Gold Unuk 1 and 2 claims are underlain by biotite granodiorite of Eocene age. Lower Jurassic volcanic breccia, conglomerate, sandstone, siltstone, and crystal and lithic tuff of the Unuk River Formation underlie the east half of Gold Unuk 1 and 2 claims. These rocks have been contact metamorphosed to hornfels along the granodiorite intrusive contact. Pleistocene and recent basaltic flows overlie all rock types in an area to the southeast of the property and part way up the valley floor of Canyon Creek.