The Plateau occurrence is found approximately 7.5 kilometres southeast of the village of Iskut. The mineralized outcrop is located on the east side of the Eddon plateau, roughly 3.5 kilometres due north of the centre of Ealue Lake and lies within the Stikine Terrane of the Intermontane Belt.
The Lower-Middle Jurassic Hazelton Group underlies the showing area and typically consists of andesitic volcanic breccias and conglomerates. These are described as grey-green and maroon, feldspar-hornblende porphyritic andesitic to dacitic debris flows and lahars; minor flows; with intervals of green and maroon epiclastic conglomerate and medium to coarse grained crystal lithic wacke with angular, red mudstone fragments.
The 3 by 5 metre mineralized area is exposed in a near-vertical, northeast-facing rock face, 150 metres long by 6 to 8 metres high. Chalcopyrite mineralization is hosted in polymictic volcanic lapilli tuff breccia. Volcanic breccia varies from matrix- to clast-supported with subangular to subrounded, 1 to 4 centimetre plagioclase-hornblende-porphyritic volcanic clasts in a poorly sorted plagiolclase-phyric tuffaceous matrix. Chalcopyrite and pyrite forms thin stringers and fine to locally coarse disseminations comprising from 10 to 15 per cent of the rock over widths of less than 0.5 metre within the broader rusty stain zone. In 1994, a sample taken at the time the showing was discovered by the British Columbia Geological Survey assayed 2.06 per cent copper, 0.011 gram per tonne gold and 71 grams per tonne silver (Fieldwork 1994, page 357).
In 2010, three of seven chip samples taken on behalf of Brett Resources Inc. yielded elevated copper values of 611, 755 and 2814 parts per million (Assessment Report 31817).
The area was first prospected in 1929 when an adit and several trenches revealed copper mineralization on the nearby Klappan Rose property (presently the HI claims (104H 014), located 2 kilometres south of the Plateau showing). A 3-year mapping program (1994-96) headed by C. Ash of the British Columbia Geological Survey has led to an updated stratigraphic framework for parts of NTS mapsheets 104G/9 and 16 and 104H/12 and 13, including the area of this occurrence. This new interpretation is published in Fieldworks 1994-1996, and Open File 1997-3. In late 2009, Brett Resources Inc. staked the North Rok claim group and then in mid-2010 carried out a reconnaissance-style program to test for possible extensions of the Rok-Coyote copper-gold system (104H 001, 12, 24). The program included silt sampling of creek drainages, prospecting and rock sampling of colour anomalies and known copper showings and occurrences and systematic rock chip sampling along elevation contour lines over the Edon stock and across the Plateau occurrence.
