Not an African, but an European miner. Brendan mentioned in an email after i answered him the same question Polish mining company KGHM as an example.
They're mining Copper/Silver in 3 underground mines between 600-1250 m, ore sickness in average 3 metres, grades approx 2% Cu-Equi (Opuwo in comparison 3% Cu-Equivalent).
Source:
PDF technical report pages 3 and 4
http://kghm.com/en/technical-report...hm-polska-miedz-sa-legnica-glogow-copper-belt
And it's surely not a coincidence that our mining consultants from Freiberg/Germany have a close collaboration with KGHM
http://tu-freiberg.de/presse/memora...ammenarbeit-mit-polnischem-bergbauunternehmen
Ann: Significant Extension to Cobalt Mineralisation at Opuwo, page-52
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