Mines across South Africa have shut down after flash flooding triggered the most severe power blackouts in more than a decade, threatening a key export sector in a further blow to the country's already slowing economy.

Petra, which said on Monday it was halting operations at its Cullinan, Finsch and Koffiefontein mines, said it had resumed operations after Eskom scaled back its programme of rolling power cuts.

(Reporting by Noor Zainab Hussain in Bengaluru; Editing by Mark Potter)