In China, 11 trapped miners were confirmed dead Thursday, a day after a mine collapsed in Shaanxi province, local authorities said.

The collapse occurred at the privately run Liujiamao coal mine in Shenmu County Wednesday morning local time.

County officials said 38 of the 49 miners who had been working underground at the time were able to escape.

The official Xinhua News Agency, citing a preliminary accident report, said the accident was caused by the collapse of the void left behind when coal is removed. However, an investigation into the cause continues.

Late last month, 29 miners were trapped when a gypsum mine collapsed in Shandong province in eastern China. Rescuers were able to make contact with at least four survivors, who have been trapped underground for nearly two weeks, Xinhua reported Wednesday.

The miners are more than 200 meters below the surface. Rescue workers have managed to get nutritional liquid to the trapped miners while efforts to drill through the fragile ground to reach them continue.

The collapse on December 25 killed at least one person, Xinhua reported. Thirteen others are missing, and 11 made it to safety or were rescued earlier.

China's mines are some of the deadliest in the world, although safety standards have improved in recent years. Last year, 931 people were killed in mine accidents in China. In 2002, nearly 7,000 miners died.