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Firestone Diamonds said stable grid power has been restored at its Liqhobong diamond mine in South Africa.
The company said Lesotho Electricity's Muela hydropower station was brought back into operation on 1 December following a two-month shut down for maintenance work.
The power interruption occurred from 1 October and the processing plant resumed production on 26 October when diesel generators were commissioned, which provided sufficient power for the plant to operate at between 80% and 90% capacity.
Additional costs associated with operating the rented diesel generators were about $1.1m, Firestone Diamonds said.
An insurance claim in respect of the loss of profit and the additional operating costs was in the process of being compiled, it added.
At 1:23pm: (LON:FDI) Firestone Diamonds PLC share price was +0.96p at 1.38p