Mount Savona is a good collecting locality for opal and agate with the best collecting areas along the cliffs below the microwave tower site. Green opal, moss agate and geodes occur in brecciated basaltic lavas of the Eocene Kamloops Group. Jasper-agate and prehnite occur along the gas pipeline right-of-way on the Indian Garden Ranch about 4 kilometres west of Mount Savona (Geological Survey of Canada Paper 72-53).