On October 3, 2005, a gas explosion occurred in a coal mine in Hanoi. On October 3, 2005, the rescue personnel prepared to rescue the well on October 3, 2005, at 4:45 p.m., the second mining gas exploded in Hanoi's Hanoi Coal (Group) Company. At the time there were 53 people operating under the well, 19 of whom went up the well, 34 people were killed. It is that the mine was the state-owned key coal mine of the province, gas, license is complete, the mining of Hanoi, approved annual production of 700,000 tons, coal production in 2004 was 69.3 million tons, coal production from January to September 2005 was 51.82 million tons.