The Jump Creek occurrence area is underlain by basalt of the Upper Triassic Karmutsen Formation (Vancouver Group) intruded by altered diorite of the Lower to Middle Jurassic Island Plutonic Suite. Magnetite skarn is developed in basalt at the contact with diorite. One of two pits expose massive magnetite lenses in skarn rock. A grab sample assayed 58.4 per cent iron (Property File - Report by Laanela).