At least four people have died and 49 more are missing after a mine collapsed in China's northern Inner Mongolia region on Wednesday.
Chinese leader Xi Jinping ordered a search and rescue operation which has so far found six survivors in the open-pit mine at Alxa League.
But desperate efforts to retrieve others were temporarily disrupted by two landslides.
It is not yet clear what caused the slope at the mine to give way.
More than 900 rescue workers had been deployed to the scene, Xinhua news agency reported.
Mr Xi has instructed authorities to make "every possible effort" to find survivors.