Greywacke sediments of Cambrian age predominate at and around the Wheal Barton mine. Copper mineralisation, together with varieties of manganese mineralisation, occur along a shear zone in bleached greywackes, which in places have been mined profitably. Previous literature suggests that all of the ore at the mine has been removed to a depth of 80 or 100 feet, hence the drilling of shallow holes in the mined area cannot be recommended. It is suggested that geophysical work be done to the north of the old mine in an attempt to locate other lodes, or that deep holes be drilled in the mine area into the primary ore zone to test the width and grade of the lode at depth.