South Africa's Harmony Gold says most striking workers back at Kusasalethu mine JOHANNESBURG (Reuters) - Harmony Gold Mining (HARJ.J), South Africa's third-largest gold producer, on Thursday said most striking workers responded to an ultimatum and were back at work. Spokeswoman Marian van der Walt said while the company was still confirming the numbers, the turnout was positive. The 23-day strike at its Kusasalethu mine has already cost the company about 13,000 ounces in lost production. Reporting by Sherilee Lakmidas