Measure is part of a broader plan to restore profitability at the division, which saw adjusted operating profit fell by 37% in the second quarter of this year.
The country's Reserve Bank has ordered platinum and chrome miners to surrender 80 percent of their export earnings to the central bank as the country struggles to contain a crippling dollar note shortage.
Kaz Minerals, a copper company focused on Kazakhstan, narrowed its full-year production guidance on Thursday to 235,000-260,000 tonnes after first-half output more than doubled, boosted by a market hitting multi-year highs.
Project will extend the life of its Spence copper mine in Chile by over 50 years, at a time when copper prices have reach their highest levels since late 2014.
