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A deeper look at contractor injuries in underground coal mines

机译：更深入地研究地下煤矿的承包商伤害

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Over the past decade, the number of contractors working in underground coal mines has nearly doubled; however, the effect this has had on the industry's injury rates has been the subject of much speculation. The confusion exists because the U.S. Mine Safety and Health Administration (MSHA) database does not assign contractor hours to the individual mining operations where they worked. To better understand the safety record of the contractor segment of the industry, the National Institute for Occupational Safety and Health (NIOSH) undertook a comprehensive analysis of the data contained in the MSHA database. The first part of the study compared overall contractor and operator trends from 1983 to 2009 related to employment, hours worked and injury rate. One unexpected finding was that the larger contractors tended to have higher injury rates than the smaller ones. The second part of the study directly addressed the role of contractors on the safety record of 10 large underground coal mines. A detailed analysis provided both injuries and estimated contractor hours worked at these mines for the period 1992-2007. Comparison between the estimated contractor injury rates and the reported operator injury rates at these mines indicated that the contractor injury rates were significantly higher at most of the operations studied. However, the industry-wide data indicates that contractor and operator injury rates have converged since 2005 and are now equivalent.
机译：在过去的十年中，在地下煤矿工作的承包商数量几乎翻了一番。但是，这对行业伤害率的影响一直是许多猜测的主题。之所以存在这种混乱，是因为美国矿山安全与健康管理局（MSHA）数据库未将承包商的工时分配给他们工作的各个矿场。为了更好地了解该行业承包商领域的安全记录，美国国家职业安全与健康研究所（NIOSH）对MSHA数据库中包含的数据进行了全面分析。研究的第一部分比较了从1983年到2009年承包商和操作员的总体趋势，这些趋势与就业，工时和伤害率有关。一个出乎意料的发现是，大型承包商的受伤率往往比小型承包商更高。研究的第二部分直接讨论了承包商在10个大型地下煤矿的安全记录中的作用。详细的分析提供了这些矿山在1992-2007年期间的工伤和估计的承包商工时。在这些矿场，估计的承包商伤害率与所报告的操作员伤害率之间的比较表明，在大多数研究的作业中，承包商的伤害率明显更高。但是，整个行业的数据表明，自2005年以来承包商和操作员的工伤率已经趋同，现在已经相当。

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