TRANSVAAL to ARGENTINA (gold mining period) 1894 use of 1d PSE with added defective 1d pmk'd Pretoria 25 FEB 94 additionally tied by red London MR 8 94 transit, reverse text headed by an unidentified 'camp' (purity, survey?) with Cape Town D/FE 28 94 transit and Buenos Aires AB 15 94 arrival, central vertical crease. Gold was discovered on the Witwatersrand, in the Transvaal, in 1886. Thousands of white and black South Africans were employed on the mines by 1890. Even though the Transvaal gold mines were the richest in the world they were the most difficult to mine because the reefs lay so deep underground. The gold had to be mined by shafts as opposed to open mines, like diamonds. £95