When the company's Pine Cove pit mine stops producing in about eight months, work will begin to turn it into a tailings storage facility with capacity of up to 7 million tonnes.
South Africa holds the world's biggest reserves of platinum, chrome and manganese, but investment in the sector has dropped in each of the past two years as a result of increasing legal uncertainty and labour disputes.
Gokhran, part of Russia's finance ministry, was influential on the global platinum group metals markets in the 1990s and 2000s, when palladium stocks it accumulated during the 1970s and 1980s came to the market and depressed prices.
Gold miners in Western Australia state are being hit with an increase in royalty payments under measures released on Thursday that are designed to return the one-time "economic engine of a nation" to fiscal health via revenue from the mining sector.