https://orcid.org/0000-0002-3365-6992
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ACKNOWLEDGMENTS
The Geological Society of South Africa granted permission to use the photo of Willemse. We acknowledge that this work was partly funded by the NRF (National Research Foundation) and CIMERA (the DSI-NRF Centre of Excellence for Integrated Mineral and Energy Resource Analysis). Any opinions, findings and conclusions or recommendations expressed are those of the authors, and therefore the NRF and DSI-NRF CIMERA do not accept liability in regard thereto.
Additional information
Notes on contributors
Frederick Roelofse
Dr. Frederick Roelofse is an associate professor in the Department of Geology at the University of the Free State, Bloemfontein, South Africa.
Bruce Cairncross
Dr. Bruce Cairncross is professor emeritus in the Department of Geology at the University of Johannesburg, South Africa.
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