中美两国煤矿发展的差距集中体现在效率、效益、管理和安全上。美国煤矿人均工效15t，而我们仅1t多；美国的煤矿赚钱，我们的煤矿大多数亏损；美国煤矿管理层次简单，手段先进，且不受外部干扰，我们的煤矿管理系统复杂，手段落后，且受外部条件影响较大；美国煤矿安全状况良好 The gap between China and the United States in the development of coal mines is concentrated in efficiency, efficiency, management and safety. The per capita efficiency of coal mines in the United States is 15t, whereas we are only 1t; the coal mines in the United States make money and most of our mines lose money; the coal mines in the United States are simple in management, advanced in measure and free from external interferences. Our coal mine management system is complex and laggard It is greatly affected by external conditions; the coal mine in the United States is in good condition