The Fran 1 occurrence is located on Mahood Creek, at an elevation of approximately 370 metres.
The area is underlain by greenschist metamorphic rocks of the Cretaceous to Tertiary Slollicum Schist. The country rocks are intruded to the west by a stock of Oligocene granodiorite and to the east by the Cretaceous Spuzzum pluton consisting of quartz diorite and diorite.
Locally, quartzites, shales and phyllite host pegmatitic quartz veins, varying from 0.1 to 1.0 metre wide, with pyrrhotite, pyrite and trace chalcopyrite mineralization. In 1985, rock samples (JF 6) assayed up to 1.71 grams per tonne gold and 25.71 grams per tonne silver (Assessment Report 14294).
In 1984 and 1985, Iris Resources completed programs of rock, silt and soil sampling, geological mapping and a ground magnetic geophysical survey.