The publicity department for the city of Huadian said faulty wiring is believed to be the cause of the fire that broke out at the Laojinchang Gold Mine, China's Xinhua news agency reported.
Fifty-seven miners were working inside the mine at the time.
The blaze resulted in a dense buildup of both carbon monoxide and carbon dioxide, officials said.
Notable deaths of 2014 [PHOTOS]
Father of murdered schoolgirl Sarah Payne dies