K92 Mining's stock traded 4.1% higher at Tuesday's market close.

Company did not say how many workers at the mine, which normally employs about 25,000 people, would be kept on to run the operation.

Silver also rallied to its highest in two months.

Oyu Tolgoi's operator also narrowed the estimated 16-30 months delay in the completion of the underground expansion to a 21-29-months range.