Map and Chart--KGS


The Fire Clay (Hazard No. 4) coal is one of the leading producers in the Eastern Kentucky Coal Field, with more than 20 million short tons of annual production and 230 million short tons mined between 1976 and 1992, according to Kentucky Department of Mines and Minerals data. Regional thickness and resources of the coal are calculated in Greb and others (1999c) and Thacker and others (2000a, b).

Stratigraphically, the coal occurs in the middle part of the Hyden Formation of the Breathitt Group (Fig. 1), which was previously part of the Breathitt Formation (Chesnut, 1992). The coal occurs between the Upper Whitesburg and Fire Clay rider coals. Locally, each of these coals may almost merge with the Fire Clay coal, forming a zone.

Publication Date



Series XII

Report Number

Map and Chart 34

Digital Object Identifier (DOI)


© 2003, by the University of Kentucky, Kentucky Geological Survey

Funding Information

Data collection was partly funded by the National Coal Resources Data System and National Coal Assessment Programs of the U.S. Geological Survey.

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