The MOUNTAIN LION showing is located on reverted Crown grant Lot 144S, approximately 1.4 kilometres north of the summit of Mount Franklin.
The showing consists of several mineralized outcrops of shonkinite-pyroxenite, which is a minor phase of the alkalic Eocene Coryell Intrusions. It has been suggested that the pyroxenite is a basal cumulate of an early monzonitic intrusion, which was later intruded and engulfed by a augite-syenite intrusion. In the Franklin camp, pyrite is commonly found disseminated near the outer contacts of pyroxenitic rocks and it is inferred from the presence of iron sulphides. Chalcopyrite is present in all of the other platiniferous showings in this area; however its presence has not been noted at the MOUNTAIN LION showing. To the east lies a pendant of Devonian- Triassic Harper Ranch Group rocks. A kilometre to the south, there are andesite and dacite flows and tuffs of the Eocene Marron Formation, Penticton Group.
The MOUNTAIN LION claim was Crown granted prior to 1915. No work was recorded on the showing during the early 1900s when the Franklin camp was active; however, a shallow shaft and an open cut are believed to date from that period.
In 1918 the MOUNTAIN LION showing was investigated for its platinum potential. A sample of rusty-weathering pyroxenite with iron sulphides was collected from a small shaft and open cut. It assayed 3.09 grams per tonne platinum (Thomlinson, W. (1920): Mineral Investigations - Platinum, Munitions Resources Commission, Canada, Final Report, page 164).
In 1964, Franklin Mines Ltd. acquired much of the Franklin camp and carried out detailed geological mapping and geophysical surveys in a number of locations. The MOUNTAIN LION showing was not covered by any of the detailed surveys.
From 1986 to 1987, Longreach Resources Ltd. and Placer Dome Inc. carried out a major exploration program in the Franklin camp area. It is probable that the Mountain Lion showing was prospected during this time, but no work was recorded.
Similar platinum occurrences nearby are the Ottawa (082ENE061), Columbia (082ENE060), Buffalo (082ENE008) and Golden (082ENE053) showings.
In September 1994, G. Johnston and R. Ronaghan visited the Mountain Lion (Lot 144s) and G.H. Fraction (Lot 9328) claims. Three traverses across the Mountain Lion claim were run, and soil samples were taken for geochemical analysis. Precious metals (gold and platinum) did not show up in any significant quantities on the Mountain Lion claim. Increased values of copper and zinc occurred as trends striking at an azimuth of approximately 100' on the claim (Assessment Report 23636).