阿拉巴马州拥有全美最深的地下开采煤矿，但这个超过２０００英尺的深度伴随恶劣的地质条件，比如煤层的变化和过量的瓦斯，随之而来的高采煤成本则是阿拉巴马州煤炭工业的稳步衰降的一个主要原因。 目前，阿州煤炭工业大部分是由长壁开采的地下矿所组成，其中大部分的煤炭由四 Alabama has the deepest underground coal mines in the United States, but this depth of over 2,000 feet is accompanied by harsh geological conditions such as coal seam variations and excess gas, with the resulting high cost of coal being Alabama Coal One of the main reasons for the steady decline in industry. At present, most of the coal industry in the state is made up of underground mines with longwall mining, most of which consists of four