The state administration of coal mine safety announced four major coal mine accidents Thursday,according to the official website of the state administration of coal mine safety.

　　Coal mine safety supervision and administration departments,coal industry administration departments and coal mine safety supervision bureaus at the provincial level in all coal-producing provinces,autonomous regions and municipalities directly under the central government,xinjiang production and construction corps:

　　Recently,four major coal mine accidents occurred in sichuan,guizhou,hebei and other places in succession,killing 21 people in total,with severe impact and profound lessons,and the situation of coal mine safety production is grim.In order to draw a profound lesson from the accident,curb the frequent occurrence of coal mine accidents,and earnestly strengthen the work of coal mine safety,the relevant information is hereby notified as follows:

　　I.basic information of four major accidents

　　(I)the July 28 gas explosion accident of houxin coal industry co.,LTD.,wangcang county,guangyuan city,sichuan province.

　　On July 28,2019,a gas explosion occurred in houxin coal industry co.,ltd.in wangcang county,guangyuan city,sichuan province,killing three people and injuring two others.The mine is a private enterprise with an approved production capacity of 90,000 tons per year and is a low-gas mine.

　　Preliminary analysis shows that the main ventilation system of this mine is not free due to roadway collapse and local ventilation fans are used for ventilation in roadway type coal mining face,which leads to gas accumulation in operation without wind breeze.Operators illegally use naked blasting method to deal with large coal Ganges,and the explosion spark triggers gas accumulation in the upper part of no.2 vertical hole.The main problems exposed by the accident are:first,the mine on June 12,due to the existence of safety exit collapse on the work surface,return wind alley many disrepair and other hidden dangers,was ordered by sichuan coal mine safety supervision bureau north sichuan supervision branch to stop production,the relevant certificates were temporarily withheld,but the mine to repair and correct the name of the work face illegal production.The second is to adopt the"roadway type coal mining"technology,which is banned by the state.The ventilation management is chaotic.A local ventilator is used to supply wind to three vertical eyes at the same time.Third,safety monitoring facilities were not installed on the accident working face,and operation rules and safety technical measures were not prepared.Fourth,the management of gas inspection and blasting was disordered,and the system of"one gun and three inspections"and"three person chain blasting"was not implemented.The personnel did not withdraw to a safe place during the blasting,and the personnel did not work without a license.Fifth,the mine is suspected of concealing,delayed accident,blind organization rescue.

　　2.Coal and gas outburst accident occurred in longwo coal mine of guizhou zheshang mining group co.,LTD.,xiuwen county,guiyang city,guizhou province.

　　On July 29,2019,a coal and gas outburst occurred in longwo coal mine of guizhou zheshang mining group co.,LTD.,liuguang town,xiuwen county,guiyang city,guizhou province,resulting in four deaths and two injuries.After the accident,the mine conceals the accident,after the masses reported verification.The mine is a private enterprise with the approved production capacity of 150,000 tons per year.It is located in the coal and gas outburst area.The gas grade appraisal result is low gas mine,and there is no risk of coal and gas outburst in the area above the elevation of+977.3 meters.

　　According to the preliminary analysis,the coal mining face in the east mountain was arranged illegally outside the scope of outburst risk appraisal to organize production,and no anti-outburst measures were taken.The coal cutting machine induced coal and gas outburst.The main problems exposed by the accident are:first,illegal arrangement of coal face,and suspected of ultra-deep mining.Production shall be organized in violation of regulations by excluding concealed areas from the above drawings,temporarily sealing the construction,recording two accounts in and out of well inspection bodies,and not carrying identification CARDS of personnel's location inspection in concealed areas.Second,the prevention and control of coal and gas outburst has not been carried out as required.No gas parameters have been measured and no outburst prevention measures have been taken.Third,the working face of the accident did not prepare operating rules,did not install safety monitoring equipment,no pressure wind self-help facilities.Fourth,ventilation management disorder,ventilation facilities are not qualified,east down the mountain coal face insufficient air volume.5.Deliberately concealing the accident,failing to report the accident to the relevant departments after the accident,and transferring the body;When the government departments concerned receive reports from the masses to the mine for verification,they falsely report the accident site and seal the accident area and organize relevant personnel to collude to supply.

　　(3)the July 31 gas explosion occurred in the dashu coal mine of guizhou xinsouthwest mining co.,LTD.,liangyan town,qixingguan district,bijie city,guizhou province.

　　On July 31,2019,a gas explosion occurred in the dashu coal mine of guizhou xinsouthwest mining co.,LTD.,liangyan town,qixingguan district,bijie city,guizhou province,killing seven people and injuring one.The mine is a private enterprise with an approved production capacity of 150,000 tons per year and is a low-gas mine.In 2015,the mine received the reply of merger and reorganization of 450,000 tons per year.

　　According to the preliminary analysis,the 17301 coal working face of this mine was flooded by water gusher in the transportation roadway,and the ventilation system of the working face was blocked.The operators used local ventilation fans to supply wind to the return air roadway,and built up the working face in the return air roadway.Accident revealed the main problems are:one is the illegal operation,the continuous heavy rainfall in the mine 17301 mining face of transport lane yield increases,the mine water disasters prevention and control measures in time,cause working face and roadway flooded parts of the system,and not to drainage,while the use of partial ventilator to return air lane for the wind,and in return air roadway construction tunneling faces up to the mountain,the illegal exploitation of coal.Second,the ventilation and gas management is not in place,the safety monitoring system is not running,and the operators do not carry portable methane alarm device,so they risk working without gas inspection.The third is blind rescue,after the accident,the coal mine enterprise did not timely report to the relevant departments,the mine manager,chief engineer to organize rescue,almost caused secondary accident.Fourth,the mine has been organizing production in the name of 150,000-tonne-per-year production in the name of the mine since it obtained the approval of 450,000-tonne-per-year merger and reorganization in 2015,without actually carrying out the related work of merger and reorganization.Fifth,the superior company of the coal mine is an affiliated shell company,which has not actually controlled the coal mine,and has not conducted effective supervision and management of the coal mine.

　　(4)the"8·2"large impact ground pressure accident of tangshan mining company,kailuan group,hebei province.

　　On August 2,2019,seven people died in the tangshan mining company of kailuan group in hebei province.The mine has an approved production capacity of 4.2 million tons per year and is a high gas and rock burst mine.

　　Preliminary analysis shows that rock burst occurred in the F5010 contact roadway in the coal pillar area of the air shaft of this mine(mining depth is nearly 800 meters),causing roof caving of this roadway and two surrounding roadway,causing serious floor heave and side heave of the roadway,resulting in death.The detailed cause of the accident is awaiting further investigation.

　　The four accidents mentioned above once again reflect that some regions and enterprises cannot stick to the red line and are driven by interests to take risks.The enterprise leaders take risks to organize illegal production,which leads to accidents.It also reflects that coal shock pressure,coal and gas outburst and water damage are still major risks of coal mine safety.