Mongolia’s giant Oyu Tolgoi mine has stopped its copper concentrate exports to China, reports news.mn.

Beijing has demanded that trucks carrying coal and copper concentrate must enter in a single convoy through the border-crossing between China and Mongolia.

This snap decision by the Chinese creates logistical and security headaches for Mongolia’s biggest exporter.

The result is that Oyu Tolgoi will have to suspend all exports of copper concentrate to China for several days.

Oyu Tolgoi is jointly owned by the Government of Mongolia (34 percent) and Turquoise Hill Resources (66 percent, of which Rio Tinto owns 51 percent).

Rio Tinto has been the manager of the Oyu Tolgoi project since 2010.