The South African consortium distanced itself from allegations that it is linked to the Gupta family, the previous owner of Optimum coal and other two assets.
The fall in iron ore purchases for 2018 came as a 70 percent plunge in profit margins since late October cut the incentive for steelmakers to ramp up output and restock raw materials.
Many investors, including nuclear power utilities, are looking a few years out at what might happen to the price of uranium once a large number of long-term contracts are signed.