Around 1885 the ore deposit of the Albert Silver mine was discovered, and production continued intermittently until 1914 (Robb, Robb, and Walraven 1994). The Albert Silver mine is situated on the farm Roodepoortjie 250JR, north of Bronkhorstspruit, some 80 kilometers east-northeast of Pretoria in Mpumalanga, South Africa (fig. 1) (Robb, Robb, and Walraven 1994). No detailed description of the mine is known to have been published, but a layout plan and a plan indicating the extent of the underground workings (fig. 3), amongst a surface geophysical study of the ore bodies, was given by Van Zijl (1965).
Dr. Paul M. P. B. Meulenbeld is a scientific manager with the Department of Water Affairs, a trained geophysicist, and mineral collector. He has a sound knowledge about southern Africa's mineral deposits and visits abandoned mines in his spare time. One of his recent discoveries was the occurrence of chapmanite at the old Argent silver and lead deposit, Delmas, Mpumalanga, South Africa.
Wiebke Grote is responsible for XRD analysis at the Department of Geology, University of Pretoria; prior to this position she was the curator of the Geological Museum at the same institution.
Dr. Sabine Verryn is the owner of XRD Analytical & Consulting. She is the current vice chair of the Mineralogical Association of South Africa.