Rescuers with backhoes and bulldozers dug through tons of earth and rubble Thursday for 48 people missing after a landslide buried an open-pit mine in northern China. Conditions in the area remain dangerous, and the search had to be suspended for several hours because of a second landslide at the gigantic facility in Inner Mongolia’s Alxa League. Cranes and other pieces of heavy equipment could be seen, along with covered trucks. Police are investigating the cause of the collapse and some people have been detained, Chang said. The official Xinhua News Agency said about 900 rescuers with heavy equipment were on the scene and they had resumed the search by Thursday morning.