South Africa's Gold Fields on Thursday posted a 47 percent decline in full-year earnings due to falling bullion prices and impairments.

Normalised earnings for the year to December fell to $45 million from $85 million a year earlier, the company said in a statement.

Gold fell $250 per ounce last year, peaking at $1,300 per ounce. South African producers are slightly cushioned by a decline in the rand as they earn in dollars while paying costs in the local currency.

Gold Fields- Africa's second biggest bullion producer by market value- booked impairments on the value of investments and its mines in Ghana and Australia.