The Mamquam River (Lori South) occurrence is located on the east side of the Mamquam River, approximately 500 metres north of the confluence with Crawford Creek.

The area is underlain by Late Jurassic dioritic intrusive rocks, of the Tertiary to Jurassic Coast Plutonic Complex, cut by a swarm of andesitic dikes. Basaltic volcanic rocks of the Pliocene to Holocene Garibaldi Group and marine sedimentary and volcanic rocks of the Lower Cretaceous Gambier Group outcrop to the west.

Locally, a quartz-orthoclase altered quartz diorite and diorite host pyrite, chalcopyrite and molybdenite mineralization in fractures and quartz veins, over a 150 by 150 metre area. The mineralized zone lies at the west end, of a 1200-metre long zone of pyritic and propylitic alteration.

The area has been historically explored in conjunction with the nearby Lori (MINFILE 082GNE020) occurrence. In 1973, Noranda completed a program of geological mapping, a ground induced polarization survey and minor sampling on the area. In 1979 and 1980, Amark Resources completed programs of soil sampling and a ground electromagnetic survey on the area as the Alco claims.

During 2012 through 2015, Billiken Gold completed programs of soil and till heavy mineral and rock sampling on the area as the Copper 1-5 claims.