The Top 27 occurrence is located about 65 kilometres southeast of Fernie a few hundred meters north of Sage Creek. The area is underlain by siltstone, argillite and quartzite of the Helikian Creston Formation, Purcell Supergroup. Much of the host stratigraphy was historically reported as Grinnell Formation.

At the Top 27 showing, stratabound chalcocite, chalcopyrite, and bornite are disseminated within quartzite horizons of the Helikian Creston Formation, Purcell Group. Malachite staining is common on weathered surfaces. Bornite and chalcopyrite also occur as veinlets and patches in quartzites.

WORK HISTORY

In 1969, Akamina Minerals Ltd. conducted a regional mapping, and geochemical program on the Grinnell Formation, a section of which underlies the claims held by Mark V and Thor. Widespread occurrences of copper mineralization were located in the Grinnell and neighbouring formations. Some of these were trenched. Most of the resulting assays appear to have been in the 0.2 to 0.9 per cent copper range, with occasional grab samples assaying up to 5 per cent copper (Property File Document 810672). The mineralization is reported to have occurred as disseminations and fine fracture fillings in quartzite beds, in shales, and to some degree in dykes and quartz vein material.

In 1970, Strato Geological Ltd., on behalf of Mark V Mines Ltd and Thor Explorations Ltd., carried out a reconnaissance silt and soil geochemical sampling and prospecting survey on their ABC, DEF, GHI, and JKL claims (Assessment Report 2746). A total of 31 rock, 28 stream silt and 60 soil samples were collected for analysis High copper values in silts were found in the areas of claim ABC 29 (082GSE054), ABC 17, and DEF 35 (082GSE093), the latter are correlated with, and explained by a copper occurrence found during the 1971 program on Grid #2 (082GSE093).

In 1971, soil geochemistry and geological mapping was completed and approximately 240 samples were collected on behalf of Mark V Mines Ltd and Thor Explorations Ltd. Several anomalous zones were indicated on the ABC, DEF, GHI, and JKL claims (Figure 3, Assessment Report 3336).

In 1972, Mark V Mines Ltd. extended the geochemical work was extended on the company's Sage Creek property. The claims involved were the ABC 1 to 4, and ABC 11 to 34. The soil sampling results revealed four soil new anomalies, in addition to an extension of the 1971 Grid #3 soil anomaly (ABC 16, 082GSE100) (Assessment Report 3931).