Witwatersrand 1886: How a Farm Became the World's Gold Capital

In March 1886 an Australian prospector named George Harrison stumbled upon a gold-bearing outcrop on a farm called Langlaagte, on the rolling veld south of Pretoria. Within a decade the resulting Witwatersrand goldfield was producing a quarter of the world's gold. Within twenty years it had triggered a war.

The reef

The Witwatersrand Basin is geologically unique. Its conglomerate reefs banket in local Afrikaans contain disseminated gold across reefs hundreds of kilometres long, dipping at shallow angles deep underground. Total gold extracted from the Wits to date: roughly 50,000 tonnes, more than half of all gold ever mined in human history.

• Discovery: March 1886, Langlaagte farm
• Johannesburg founded: October 1886
• Wits cumulative production: ~50,000 tonnes
• 1898 Transvaal share of world gold output: ~27%
• Average ore grade historically: 8 g/t (declining today)

Johannesburg in five years

By 1891 the city of Johannesburg had over 100,000 inhabitants. Stock exchanges sprang up. British, German, and French capital flooded in. The Boer republic of the Transvaal, suddenly the wealthiest state in southern Africa, found itself flooded with foreign workers (the Uitlanders) demanding political rights its government had no intention of granting.

"The richest spot of earth on the face of the globe." 1899 description of the Wits, attributed to a London mining journalist

The Boer War

British anxieties about the Wits and Uitlander grievances together drove the Second Boer War (1899-1902). Britain spent over 200 million pounds and lost roughly 22,000 troops securing what was, in essence, a goldfield. The war's brutal concentration camps killed an estimated 28,000 Boer civilians and tens of thousands of Africans.

The long shadow

Wits gold financed Britain's reserves through the World Wars. The mining industry's labour system migrant workers from across southern Africa, hostels, pass laws became the architectural template for apartheid's racial labour controls. Modern South Africa cannot be understood without the Wits.

Takeaway: Johannesburg is the only major world city that exists primarily because of a single mineral discovery. The political and economic consequences are still being lived.