Turquoise Hill deal to exit Mongolia miner SouthGobi falls through

By Susan Taylor TORONTO (Reuters) - A deal that would have allowed Canada's Turquoise Hill Resources Ltd to unload its remaining stake in Mongolian coal miner SouthGobi Resources, a company that was once worth billions of dollars, has fallen through. Turquoise Hill said on Friday that the agreement with National United Resources Holdings expired on April 30. The deal's failure marks another setback in Turquoise Hill's effort to sever ties with SouthGobi , a company hit by a slowing Chinese econo