The Pioneer gold mine, one of Russia's largest, is in the Amur region which borders China, about 5,300 km (3,300 miles) east of Moscow.

Emergency workers would study water deposits discovered at the bottom of four shafts, the emergencies ministry said in a statement posted on the messenger app Telegram.

"This will allow us to establish a complete picture of the entire depth of the mine and make a decision on further work," it added.

The ministry earlier said that the mine was probably flooded.

(Reporting by ReutersWriting by Felix LightEditing by Andrew Osborn and Andrew Heavens)