Acknowledgements
The authors would like to thank Multotec for their
financial support of this work and for permitting its publication.
The authors would also like to thank Idwala Magnetite
for their generous donation of magnetite, A.P.
Mahlangu for his assistance in performing the experiments,
and J.A. Venter for the technical support he provided. Finally,
the authors would also like to express their gratitude
to Prof. Chris Pistorius for his keen interest in the work
and his encouragement during the undertaking of the
work.