The Matt Berry deposit consists of roughly concordant layers of massive galena, sphalerite, pyrrhotite and chalcopyrite in Paleozoic phyllite. Drill-indicated reserves in 1979 were calculated at 533 434 tonnes grading 6.1% Pb, 4.8% Zn and 102.9 g/t Ag. The mineralization appears to have replaced the host phyllite along a narrow shear zone which strikes northnorthwest and dips at a moderate angle to the east. Geochemical and geophysical surveys in 1987 outlined a new exploration target 1 km along strike to the southeast.