The area of the PBE 66 occurrence is underlain by undivided sedimentary rocks of the Triassic Brooklyn Formation and Devonian to Permian rocks of the Knob Hill Group. These are intruded by dikes, sills and plutons of the Eocene Coryell Plutonic Suite which are syenitic to monzonitic in composition. The Paleozoic rocks, consist primarily of greenstone, chert, argillite and limestone.

A copper occurrence with minor gold and silver values was reported to occur in a massive sulphide-bearing skarn zone in limestone adjacent a granitic dike along with, or near to, a molybdenite showing. It was sampled in 1977 or 1978 by Consolidated Boundary Exploration Limited and yielded 0.18 per cent copper over 1.5 metres (Assessment Report 7235, page 8). A map of the U2 claims in the same report that showed reconnaisance geology indicates a skarn occurrence with with pyrrhotite, chalcopyrite and molybdenite. This skarn showing is indicated as having the same geological setting as given for the assay sample above and is assumed to be the same showing. This showing also closely approximates the location for molybdenum showing 11 indicated in previous work by Cronus Minerals (Assessment Report 3172).

In 1970 or just prior thereto, Boundary Exploration Limited conducted trenching on their SD claims. In 1971, Cronus Minerals Limited conducted an airborne magnetometer and scintillometer survey over their SD and PBE claims.

In 1977, Consolidated Boundary Exploration Ltd. conducted mapping and collected 4 samples on the U2 claims which covered the old PBE occurrences such as MINFILE 082ESE138, 139, 140, 218 and 219. In 1978, Consolidated Boundary conducted a program of stripping, and rock and soil sampling (103 soils). They also conducted 4 kilometres of ground magnetometer and scintillometer surveying.

During 2008 through 2012, Grizzly Discoveries Inc. completed programs of geochemical sampling, geological mapping and ground geophysical surveys on the area as the Attwood area of the Greenwood property.