The Cub porphyry molybdenum prospect is in the southeast part of the Shulaps Range, underlain by schists and phyllite of the Mississippian to Jurassic Bridge River Complex (Group) and intruded by syn- and post-tectonic granitic and felsic porphyritic bodies. These rocks are, in turn, structurally overlain by the Shulaps Ultramfaic Complex. Granodiorite of the Eocene Mission Ridge pluton and Tertiary Rexmount quartz-feldspar porphyry occupy the central part of the Shulaps Range. Mineralization of the Cub prospect is exposed in the wall and cirques which forms the southwesternmost drainage tributary to La Rochelle Creek within the Cub 200 claim.

The prospect consists of molybdenite and pyrite as disseminations and stockwork within silicic granodiorite, and molybdenite and chalcopyrite within one-metre thick blocks of vein quartz. The majority of the molybdenite occurs as irregular stockworks within potassic and silicic protomylonitic granodiorite. Alterations minerals include ferrimolybdite, malachite, azurite and limonite.

These rocks generally contain less than 0.2 per cent molybdenite. Blocks of vein quartz within the main gully on the hillside contain the greatest concentration of metals - up to 0.5 per cent molybdenite, 1 per cent copper, 2 grams per tonne gold, 50 grams per tonne silver and anomalous bismuth, lead and zinc (Fieldwork 1989, page 284).

The exposures of granodiorite in which molybdenite has been observed occupy and area of at least 650 metres by 120 metres and span an elevation difference of over 250 metres.