The ER occurrence outcrops on Trehearne Mountain, 3.1 kilometres east-northeast of the confluence of Rampart and Swanson creeks and 20 kilometres north-northeast of Princeton.

The area along Summers Creek is underlain by the Eastern volcanic facies of the Upper Triassic Nicola Group, comprising mafic, augite and hornblende porphyritic pyroclastics and flows, and associated alkaline intrusions. These rocks are intruded by granodiorite and quartz diorite of the Middle to Upper Cretaceous Summers Creek pluton.

Locally, traces of disseminated molybdenite occur in porphyritic granodiorite of the Middle to Upper Cretaceous Summers Creek pluton. Small amounts of chalcopyrite are also reported.

Work History

In 1970, J.H. Montgomery completed a program of biogeochemical and soil sampling on the area as the ER 1-8 claims.

In 1981 and 1982, Canadian Nickel Company Ltd. completed programs of geological mapping, geochemical (rock, silt and soil) surveys and ground magnetic and electromagnetic surveys on the area as the Rita 1-4 claims.

Fairfield Minerals Ltd. re-staked the area in 1987 as the Swan 1-5 claims after finding anomalous gold in stream silts at the mouth of Swanson Creek. In 1989 and 1990, the company completed programs of prospecting and geochemical (rock, silt and soil) sampling in the area for vein-hosted gold deposits. During 1991 through 1995, further programs of trenching and geochemical (rock and soil) sampling were completed on the claims.

In 2009, Solitaire Minerals Inc. completed a program of geological mapping and geochemical (silt and soil) sampling on the surrounding area as the Rita Area A and B claims.

In 2018, John Billingsley completed a minor program of prospecting and rock sampling on the area as the Rita property.