1　前言美国 2 0 0 0年煤炭产量还未统计出来 ,估计会比1999年的低。产量的降低不是长壁生产能力受限而导致的。实际上 ,与前几年煤炭市场萎缩、所有者变更频繁相比 ,2 0 0 0年大多数煤矿得益于稳定的市场需求和没有频繁的长壁矿井产权交易。近几年 ,美国煤矿长壁开采没有大的 1 Foreword The US production of coal in 2000 has not yet been calculated and is expected to be lower than in 1999. The decrease in production is not caused by the limited production capacity of the longwall. In fact, most of the coal mines in 2000 benefited from the stable market demand and the absence of frequent longwall mine property rights transactions compared with the previous years when the coal market was shrinking and owners were changing frequently. In recent years, there is no big coal mining in the US