The miner, Africa's biggest gold producer, reported a loss of $176 million in the six months to June 30, compared to a profit of $52 million in the same period last year.
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.
Experts and mining companies fear some of the modifications that go in effect in November, will result in hefty taxes, higher research costs and decrease interest from foreign investors.