1. Department of Geography, Geology and Environment, University of Hull, Hull HU6 7RX, UK
2. Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
3. Geospatial Research Ltd, Harrison House, Durham DH1 4EL, UK
4. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Resources, China University of Geosciences, Wuhan, 430074, Hubei, China
5. Centamin, 2 Mulcaster Street, St Helier, Jersey, JE2 3NJ, UK