The Middle Pennsylvanian (Bolsovian) Leatherwood coal in the central part of eastern Kentucky is a moderately thick, moderate-S seam that has been one of the major energy resources in the region. Much of the seam profile consists of clarain, dull clarain, and durain with some brighter lithologies at the base of the seam and in the upper portion of the coal at one site. A previous study emphasized petrographic trends. In this investigation, the geochemistry of the coal is examined. Some elements, such as Ge and Ga, are enriched at 2× and 5× the World hard coal averages in the coal lithotypes adjacent to rock (roof, floor, partings). Arsenic and other chalcophile elements (Zn, Co, Ni) tend to be concentrated at the top and bottom of the seam profiles and below partings, generally in the coals with the highest pyritic sulfur content. Manganese enrichments occur in bright clarain lithologies at one site. No coal lithology reaches a 5× the World hard coal average, but samples between the 2× and 5× World hard coal averages tend to be at the top and bottom of the coal seam. Most coal samples tend to have a light rare earth element (LREE) enrichment. The basal lithotype at all sites, though, has a heavy REE enrichment and, via inference from the Zr and TiO₂ concentrations, a smaller influx of detrital minerals than the basal lithotypes in many Appalachian coals. While the nature of REE associations is complicated by the high volatile A bituminous coal rank, the relatively high concentrations of the heavy REE suggest an original, albeit possibly not exclusive, organic association for those elements.

肯塔基州东部中部的中宾夕法尼亚州（波尔索维亚）莱瑟伍德煤是中等厚度、中 S 煤层，一直是该地区的主要能源资源之一。大部分煤层剖面由 clarain、暗 clarain 和 durain 组成，在煤层底部和一处煤层的上部有一些较亮的岩性。先前的一项研究强调了岩石学趋势。在这项调查中，我们对煤的地球化学进行了检查。一些元素，例如 Ge 和 Ga，在邻近岩石（顶板、底板、煤缝）的煤岩型中富集度是世界硬煤平均值的 2 倍和 5 倍。砷和其他亲铜元素（Zn、Co、Ni）往往集中在煤层剖面的顶部和底部以及分缝下方，通常集中在黄铁矿硫含量最高的煤中。锰富集出现在某一地点的明亮的克莱恩岩性中。没有煤炭岩性达到世界硬煤平均水平的 5 倍，但介于 2 倍和 5 倍世界硬煤平均水平之间的样品往往位于煤层的顶部和底部。大多数煤样往往富含轻稀土元素 (LREE)。然而，所有地点的基底岩型都具有大量稀土富集，并且通过 Zr 和 TiO ₂浓度推断，碎屑矿物的流入量比许多阿巴拉契亚煤的基底岩型要少。虽然 REE 关联的性质因高挥发性 A 级烟煤而变得复杂，但相对较高浓度的重 REE 表明这些元素存在原始的（尽管可能不是唯一的）有机关联。