The region in which the Santa showing occurs is underlain by Lower Cretaceous Gambier Group metavolcanic and metasedimentary rocks preserved in the Callaghan Creek roof pendant, hosted by plutonic rocks of the Jurassic to Tertiary Coast Plutonic Complex. The property is underlain by andesitic tuff, tuffaceous sandstone and siltstone and limestone of the Gambier Group which has been intruded by dioritic bodies. Basalt of the Pliocene to Recent Garibaldi Group overlies these older rocks.

Mineralization is reported to be scheelite in limestone or greisen accompanied by pyrite and minor chalcopyrite, ferrimolybdite and tetrahedrite.

Drilling in 1979 failed to intersect significant mineralization.