The Dictator claim is underlain by limestone and quartzite of the Mississippian to Lower Permian Milford Group. A narrow quartz-calcite-galena-sphalerite vein striking 130 degrees with vertical dip occurs. Fine-grained disseminated sphalerite also occurs in the adjacent limestone. A 1980 drill hole near the vein encountered a 0.9-metre wide quartz-calcite vein hosting a small amount of sphalerite. Some tunnelling occurred on the Dictator in the 1890s.