Koffyfontein,
Monastery, Kaalvallei, New Driekopjes, New Randfontein Reef, Voorspoed
and Roberts-Victor. The Elandsdrift Diamond Mining Company and a
smaller company, are on a large pipe in the heart of the Vaal River
diamond country. Near Pretoria in the Transvaal are the Premier,
Schuller, Kaalfontein, Montrose and Beynespoort. Of all these, the most
important are the Jagersfontein, Premier, Roberts-Victor and
Voorspoed. The output for these four mines for 1907 being: