BEIJING: Mongolian Prime Minister Sanjaa Bayar tendered his resignation on Monday due to health reasons, a government spokeswoman said, creating new political uncertainty in the poor but resource-rich Asian nation. “Today the prime minister has handed in his resignation,” the spokeswoman, who would not give her name, told AFP by telephone from the Mongolian capital Ulan Bator. “He could not perform his duties” due to health concerns, she said, declining to provide further details about his condition.