I have acquired this medal - will post photos and the Vorm B once received. Preliminary research shows that he was taken POW at Paardeberg on 27 February 1900 when 30 years old, and incarcerated on St. Helena. He appears to have hailed from the Potchefstroom/Rustenburg area.
FWIW, the concentration camp records show 27 women and children and 1 older man from the farm Bronkhorstfontein in the District of Potchefstroom; within this group are who appear to be Hendrik Roets's wife (Mrs Hendrick Roets) and 2 sons (Johannes Roets aged 8 and Rudolf Roets aged 6). The Roets family all survived. The Johannesburg concentration camp, where all the farm inhabitants were initially interned, was an urban camp with a death rate below average for Transvaal camps.
Tragically, Andries Visser and Katrina van der Venter, both aged 2 years, from the same farm both perished. They may have succumbed during the measles epidemic, though the cause of their deaths is not recorded.
The past is not dead. In fact, it's not even past.