Freeport-McMoRan's Copper & Gold has restarted some operations at its open-pit copper mine in Indonesia, about two weeks after one of worst mining disasters in the country.

PT Freeport Indonesia, the operator of the mine, is slowly resuming its operations after some works began at Grasberg open-pit and mill on 28 May.

The accident occurred on 14 May when a tunnel collapsed underground training room at Big Gossan mine, more than a kilometer away from Arizona-based Freeport-McMoRan’s Grasberg mine, the third-largest open pit copper mine worldwide.

Freeport said that a preliminary inspection of the incident has been completed by the mine inspectors appointed by the Ministry of Energy and Mineral Resources.

The open-pit mine produces about 140,000 tons of copper ore per day. The output from its underground operations is 80,000 tons.