SYDNEY (Reuters) - Miner BHP Billiton may be forced to scrap its plan to rewrite the way billions of dollars of iron ore are sold every year after rival Rio Tinto struck a benchmark deal with China, ... June 14 (Reuters) - BHP Billiton became the latest mining company to commit to a large-scale iron ore project in West Africa when Liberia said on Monday the two sides had signed a deal that could be ...