The ESP occurrence is located on a small creek, west of Espinosa Inlet and approximately 6 kilometres north of Newton Cove.

The area is underlain by sediments and volcanics of the Lower Jurassic Bonanza Group, intruded by a 2.7 by 1.4 kilometre stock of the Eocene Catface Intrusions. The intrusive rocks range from microdiorite to pink syenite. Bonanza Group rocks include thin-bedded limestone, clastic sediments and andesitic tuffs and flows.

Locally, massive chalcopyrite mineralization is hosted by a 335 metre long, west trending, shear zone crosscutting tuffs and sediments. Massive chalcopyrite and quartz-chalcopyrite were reported over 122 metres, and chalcopyrite was reported from garnetized limestone near the intrusive contact. In 1972, sampling yielded up to 28.12 per cent copper over 0.45 metre (Assessment Report 4280).

Another area of mineralization, measuring 61 by 61 metres, was reported to contain disseminated chalcopyrite in tuff, 91 metres from the shear zone. In 1972, sampling of bulldozed trenches yielded values of 0.75 per cent copper (Assessment Report 4280).

In 1972 and 1976, Espina Copper Development completed programs of geochemical sampling, geological mapping and trenching on the area as the ESP claims.