The Le Roy showing is located on the east slope of Mount McGuire about 11.0 kilometres north-northeast of Alice Arm.

The showing consists of a flat-lying vein developed in skarn altered Upper Triassic Stuhini Group sediments. The quartz-albite-epidote-garnet skarn alteration is the result of the intrusion of four small, closely spaced, quartz monzonite stocks of the Eocene Alice Arm Plutonic Suite just west of the showing. These stocks host the Ajax molybdenum deposit (103P 223). The quartz vein is mineralized with pyrite, sphalerite, galena and tetrahedrite. A grab sample assayed from 23.37 per cent to 50.87 per cent zinc equivalent for gold, silver, lead and zinc (Minister of Mines Annual Report 1926, page 81). In the vicinity, numerous small flat lying quartz veins and veinlets contain variable quantities of molybdenite, pyrite, pyrrhotite and rare chalcopyrite.

In 1926, significant surface work consisted of stripping and opencutting and a drift 30 metres long was driven on the Discovery No. 1 vein.