The company may also cut head-office jobs by 40 percent. "In the current low-price environment, which is expected to persist, Kumba is reviewing all aspects of its business," the company said as part of parent Anglo's investor presentation in London today. Iron ore fell to the lowest in more than five years last month as the Chinese economy slowed and the world's biggest producers BHP Billiton Ltd. and Rio Tinto Group Plc increased supply.