Answer:
Barberton Gold Mines. Of the multitude of gold mines discovered and worked in the late 1880s, four are still being mined. They are Agnes (Company: African Pioneer Mining) New Consort, Fairview and Sheba collectively known as Barberton Mines.
SHEBA GOLD MINE
One of the first discoveries in the Sheba valley was the "Nil Desperandum Lode". While prospecting downstream from the Nil Desperandum Lode, Edward Bray (1824-1887) discovered the rich Golden Quarry which yielded 8 oz of gold per ton in a trial crushing. This led to intense prospecting and mining activity in the vicinity and numerous companies were formed.
AGNES GOLD MINE
Jack Greaves was a prospector from the UK and discovered gold here in 1888. The mine is named after his wife Jessie Agnes. The Jessievale plantation. 40 km south-east of Carolina, is also named after her. He sold the mine for 1000 pounds to A J Knuckley who later sold it to Rowe and Gibson.
FAIRVIEW GOLD MINE
Numerous individual mines operated within the confines of the Fairview property. One of the earliest producers from this area was the Kidson Reef Gold Mining Company Limited, formed in 1887. Fairview today, is the only gold mine in South Africa that has a box plant to extract gold.