The Mero 3 occurrence is located west of the Cameron River, approximately 2.5 kilometres east of Loon Lake.

The area is underlain by Paleozoic Sicker Group rocks of the Nitinat, Myra, and Buttle Lake Formations, and lesser amounts of Triassic basaltic rocks of the Karmutsen Formation. A major north westerly- striking fault zone runs through the property, with associated local shear deformation and listwanite alteration in Sicker Group volcanic and volcaniclastic rocks.

Mineralization includes small lenses of pyrite associated with listwanite (quartz-carbonate alteration), common disseminated sulphides, and fracture-controlled sulphides. Iron-bearing sedimentary rocks were also noted. Alteration and mineralization are related to shearing.

In 1986, Nexus Resources and Reward Resources completed a program of geological mapping, prospecting and rock and silt geochemical sampling. Rock sampling of a pyritic cherty tuff assayed up to 0.240 gram per tonne gold and 2.6 grams per tonne silver (Sample 509; Assessment Report 15557).

In 2009 and 2011, P. Saulnier completed programs of prospecting and soil geochemical sampling on the area as the Horn Lake and Bitterroot properties.