Flowing Bowl Mine was one of a number of individual, self-contained small workings in the Jumbo area. In 1934 these small workings numbered fifteen and all within five miles of Jumbo Siding. Each workings operated on an east-west striking northerly dipping reef.
General Asbestos Co Ltd was incorporated 1 September 1932 in Salisbury, Southern Rhodesia. In April 1933, the company acquired the Flowing Bowl Mine and in October the same year, changed its company name to Rhomines Ltd.
The Pickstone Gold Mines Limited was registered in 1912 with an authorised capital of £50,000. In 1914 they reported that three separate reef’s had been more or less developed and a large quarry containing rubble opened up. The mines included Concession Hill, Pickstone East and Pickstone West.
In 1960 Pickstone was acquired by Rio Tinto Rhodesia Limited.