Kyrgyzstan's prime minister said that forming a joint venture with Centerra Gold to develop the Kumtor gold mine was no longer in the country's interests after the Canadian group revealed smaller gold reserves at the deposit. The Central Asian state and the Toronto-listed company have been in talks since late 2013 over a deal that would involve Kyrgyzstan swapping its 32.7 percent stake in Centerra for half of a joint venture that would control the Kumtor mine.