But the International Atomic Energy Agency (IAEA) failed to disclose what the missing materials were, or whether it knew about them before they disappeared.
The sector is facing an even more uncertain future as the impacts from weaker demand and environmental regulations are creating more contractual volatility from the utilities to the railroads.
As BHP considers the sale of almost all of the businesses that Billiton brought to the 2001 merger deal, experts say the firm is likely to end up leaving London.