Voting is underway in Mongolia for a tightly contested presidential poll a year after parliamentary elections triggered deadly riots.The ballot is being closely watched from outside with foreign investors keen to tap into Mongolia’s vast mineral wealth. Opinion polls running up to the vote have suggested the final result will go to the wire. Until recently current president Nambariin Enkhbayar of the ruling Mongolian People’s Revolutionary Party had been expected to win re-election with ease but his party has been dogged by corruption allegations and widespread anger over poverty. Opposition rival candidate Taskhiagiin Elbegdorj of the Democratic Party has promised change, vowing to reform how Mongolia’s mineral resources are distributed. Hit hard by the global collapse in the price of copper — one of its main sources of revenue — last June five people were killed and hundreds injured in violent clashes after parliamentary elections.