compiled by the Tectonic Map Committee of the Tasmania Division, Geological Society of Australia, from information supplied by Electrolytic Zinc Company of Australasia, Hydro-Electric Commission, Lyell-E.Z. Explorations, Mt. Lyell Mining and Railway Company, Rio Tinto Australian Exploration Pty., Tasmanian Mines Department and University of Tasmania ; map production by Drawing Office, Department of Mines, Hobart