1. Camborne School of Mines, University of Exeter, Penryn Campus, Treliver Road, Penryn, Cornwall, TR10 9FE, UK
2. Global Centre for Mineral Security and Julius Kruttschnitt Mineral Research Centre (JKMRC), Sustainable Minerals Institute, The University of Queensland, St Lucia, Brisbane, Queensland QLD 4072, Australia
3. WH Bryan Mining Geology Research Centre, Sustainable Minerals Institute, The University of Queensland, St Lucia, Brisbane, Queensland QLD 4072, Australia