David Huston is research scientist at the Geoscience Australia, Minerals and Natural Hazards division. His research concerns geochemistry, mineralogy, especially Pyrite, as well as Archean and volcanic rocks. His studies in Mineralogy integrate field topics such as siltstone, Red beds, geologic records and clastic rocks.Jens Gutzmer is the founding director of the Helmholtz Institute Freiberg for Resource Technology. He is Visiting Professor at the Paleoproterozoic Mineralization Research Group (PPM) in the Department of Geology, University of Johannesburg, South Africa. His research interests include geometallurgy, mineral systems analysis and ore-forming processes in the context of Earth’s evolution.