Ханган нийлүүлэгчид
HONG KONG (Reuters Breakingviews) Rio Tinto has sounded a copper warning from the Mongolian steppe. The 104 billion mining giant says its flagship Oyu Tolgoi expansion in the country''s south will be up to 30 months late, and could cost as much as a third more than planned. That''s a fresh blow to a project that has been battered ..