Rescuers work at the scene where a large-scale landslide hit a mining area in Maizhokunggar County of Lhasa, southwest China's Tibet Autonomous Region, March 29, 2013. Dozens of workers from a subsidiary of China National Gold Group Corporation were trapped. The exact number of trapped workers were not immediately known. (Xinhua/Chogo)

Photo taken on March 29, 2013 shows the site where a large-scale landslide hit a mining area in Maizhokunggar County of Lhasa, southwest China's Tibet Autonomous Region. Dozens of workers from a subsidiary of China National Gold Group Corporation were trapped. The exact number of trapped workers were not immediately known. (Xinhua/Chogo)

Photo taken on March 29, 2012 shows the scene where a large-scale landslide hit a mining area in Maizhokunggar County of Lhasa, southwest China's Tibet Autonomous Region. Dozens of workers from a subsidiary of China National Gold Group Corporation were trapped. The exact number of trapped workers were not immediately known. (Xinhua/Chogo)

Rescue vehicles move to the site where a large-scale landslide hit a mining area in Maizhokunggar County of Lhasa, southwest China's Tibet Autonomous Region, March 29, 2013. Dozens of workers from a subsidiary of China National Gold Group Corporation were trapped. The exact number of trapped workers were not immediately known. (Xinhua/Chogo)