The area of the PBE 71 and 73 occurrence is mapped as being underlain by undivided sedimentary rocks of the Triassic Brooklyn Formation which is in fault contact to the east with the Proterozoic Grand Forks Gneiss complex. Devonian to Permian rocks of the Knob Hill Group underlies the Brooklyn Formation. The Paleozoic rocks, consist primarily of greenstone, chert, argillite and limestone. Intruding the stratigraphy of the area are granitic plutons of the Jurassic Nelson Intrusions and dikes, sills and intrusions of the Eocene Coryell Plutonic Suite which are syenitic to monzonitic in composition.

Finely disseminated molybdenite and pyrite occur in limey skarn next to a syenite-limestone contact. Molybdenum assayed 0.037 per cent from this zone (Assessment Report 3172, Figure 16, No.8 Zone).

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 and documented this occurrence and several other PBE occurrences to the south. 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.