In a filing Wednesday with U.S. regulators, the London-based global mining giant said it continues to talk with the Aluminum Corporation of China (Chinalco) — its largest shareholder — about its ownership interests.

"If any arrangement is agreed, it may be a bipartite or tripartite arrangement with (Ivanhoe) and/or Rio Tinto," it said.

Any such arrangement may require approval from Ivanhoe, Rio Tinto and the Mongolian government.