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Geology and Mineralogy of the Rhenosterkop

March 27 - March 28


The Northern Cape Branch presents;

“Geology and Mineralogy of the Rhenosterkop tin, tungsten and zinc deposits”

Allan Saad will present a talk on Rhenosterkop, a significant tin, tungsten and zinc deposit largely exposed on the surface and located adjacent to a tarred road on one side and the Orange River on the other. The economic potential was recognized for the first time by a Rio Tinto geologist named Dr Vaughn Armstrong in the early 1980s who discovered the deposit by means of geochemical soil sampling techniques.

The mineralization is not visible in hand specimen and is hosted within an A-typical quartz, biotite, topaz greisen. Typical greisen deposits contain muscovite and not biotite, making Rhenosterkop unique in its mineralogy. The biotite greisen is believed to have formed by hydrothermal fluids altering the host granitic rock along thrust planes forming shallow dipping sheet-like bodies which merge to form a massive mineralized and greisenized body in the centre. The body is weather resistant compared to the surrounding granites and forms an outcropping ridge 1500 m long and 300 m wide, with a dip of 15 degrees to the east. The deposit contains 29 million tonnes at a grade of 0.124% Sn, 0.583% Zn and 0.016% WO3 with a stripping ratio of 0.27:1.

Accommodation: Tented camp and/or chalets

Programme of the Events 27 March 2020

Dinner will be included in the registration cost (one large Pizza per person with drinks)

Time slot



18:00 – 18:30Mr Allan SaadGeology and mineralogy of the Rhenosterkop tin, tungsten and zinc deposit.
18:30 –19:00Mr Shane DoggartUnderstanding the source(s) of the Orange River Pegmatite Belt.
19:00 –19:20Dr Hermann PraekeltA geological perspective of the Bushmanland.

Programme of the Events 27 March 2020

Breakfast will be for everyone’s own account.

Time slotGuided field excursionDescription
08:00 – 11:00Mr Allan Saad and

Dr Hermann Praekelt

Field excursion to the Rhenosterkop deposit. The guided field trip will be led by Mr Allan Saad and Dr Hermann Praekelt.

Contact admin.nc@gssa.org.za for further details.


March 27
March 28
Event Category:


Lake Grappa
Vroeê Son
Marchand, Kakamas, 8870 South Africa
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