The Rok showing outcrops 1.5 to 3 kilometres northwest of Hayes Creek and 14 to 16 kilometres northeast of Princeton.

Molybdenite occurs as rare flakes in the aplitic border phase of the Middle Jurassic Osprey Lake batholith. The aplite surrounds and intrudes a zoned sill 3 kilometres long and 0.7 kilometre wide, comprised of microdiorite and hornblende-magnetite-biotite diorite, possibly of Triassic age. Molybdenite is reported to form rosettes in one instance (Assessment Report 14804).

The showing was mapped and soil sampled by Amax Exploration Inc. in 1971. Suburban Resources Ltd. prospected the showing in 1983.