Most of Google's hits start with the following text "In 1881 a London financier, David Benjamin obtained the mining rights"
however changing the search criteria to "London financier David Benjamin Transvaal" gives additional hits including;
" Gold was discovered later at Pilgrim's Rest in the Transvaal Drakensberg mountains in September 1873.
London-based financier David Benjamin founded the Transvaal Gold Mining Exploration and Land Company in 1883 which did not allow private individuals to own land in the area, and hence no permanent buildings were erected. The gold rush did not last long and the town was mostly abandoned."
this is believed to be from T.V. Bulpin's book The Golden Republic pg 132
there is also mention of David Benjamin in the Jewish Yearbook found on archive.org
He is also mentioned here
Also mentioned here http://www.firsturanium.com/sjfu/action/media/downloadFile?media_fi... WRT farms purchased
My guess is that more info could be found through Chamber of Mines library and archives as well as via SA Jewish organisations
There is some blurb on him ex Prospector's hiking trail
"In 1881, a London financier, David Benjamin, obtained the mining rights concession of the farms Ponieskrantz (on which Pilgrim’s Rest is located), Ledovine, Waterhouboom, Driekop and Grootfontein, and established the Transvaal Gold Exploration and Land Company. In 1895, various smaller companies merged with Benjamin's company and in 1896 the Transvaal Gold Mining Estates (TGME) was formed. The mining operation continued until 1972 when TGME closed down the Beta mine. Since 1974 the provincial administration has managed Pilgrim's Rest as a living museum. There are a few new mines active in and around the Pilgrim's Rest area, but the main attraction seems to be the many tourism activities in the area."
This one Nicholas?? "David Benjamin was another prominent Dunedin merchant who came to play a substantial role in the leadership of the Dunedin Jewish Congregation. His father, Joseph Benjamin, was a rabbi who had migrated to England from Prussia, where the family name had been Theomin. David Ezekiel Benjamin was born in Bristol in 1852. He moved to Dunedin in 1879, after a few years living in Melbourne. In 1885 he had his name officially changed to David Edward Theomin. David Theomin held the posts of president and treasurer of the Dunedin Jewish Congregation for many years from the mid-1880s and was active in a variety of other social institutions including the Royal Dunedin Male Choir, the Dunedin Chamber of Commerce, the Shipwreck Relief Society, the Patients and Prisoners’ Aid Society and the Otago Patriotic Council. Like some of his predecessors and fellow Jewish leaders, Theomin tried in vain to encourage the local Jewish congregation to pay greater attention to Sabbath observance."