Coal

 The causes of the coal mine explosions was methane ignition causing a massive coal dust explosion and a gas outburst. Families in the United States are compensated for the deaths of their family by the United States giving them 1.5 million dollars each. This compares to the compensation of Chinese families because the Chinese families only get $1,577.  Miner safety conditions are so much worse in China because there's no monitoring systems in the mine don't work and the accident preventions were inadequate.