The Fall molybdenite showing occurs to the west of Lillooet River, about one kilometre south of the mouth of Salal Creek in the Pacific Ranges. The region is underlain by plutonic rocks of the Jurassic to Tertiary Coast Plutonic Complex, roof pendants of rocks of Lower Cretaceous Gambier Group (or its equivalent, the Fire Lake Group) and Pliocene to Recent volcanic rocks of the Garibaldi Group.

The Fall property is underlain mainly by quartz monzonite and alaskite although deformed andesitic rocks of the Fire Lake Group are preserved as roof pendants within plutonic rocks. Parts of the property are covered by porphyritic basalt of the Garibaldi Group.

Mineralization consists of molybdenite in fractures associated with quartz and sparse pyrite. Weak kaolinite alteration is common adjacent to mineralized fractures.