On June 3, 2014 (May 6, 2014 in the lunar calendar), the "6.3" major gas accident occurred in Chongqing Yanshitai Coal Mine. At 5 o'clock in the morning on June 4, 2014, about 10 120 ambulances drove out from the wellhead of Yanshitai Coal Mine of Nantong Mining Company in Wansheng Economic Development Zone, Chongqing. On the evening of the 3rd, Chongqing Coal Mine Safety Supervision Bureau announced that at 17:40 on June 3, 2014, a major gas accident occurred at the 4406S2 mining face of Yanshitai Coal Mine of Nantong Mining Company in Wansheng Economic Development Zone, Chongqing. Up to now, The accident has caused 22 deaths.