1. Fullagar Geophysics Pty Ltd, PO Box 1946, Toowong, Qld 4066, Australia.
2. Corresponding author.
3. Mira Geoscience Asia Pacific Pty Ltd, PO Box 1946, Toowong, Qld 4066, Australia.
4. Mira Geoscience Asia Pacific Pty Ltd, 45 Ventnor Avenue, West Perth, WA 6005, Australia.
5. ARC Centre of Excellence in Ore Deposits (CODES), University of Tasmania, Private Bag 79, Hobart, Tas. 7001, Australia.
6. Present address: Centre for Geoscience Computing, University of Queensland, St Lucia, Qld 4072, Australia.