Item Number: OFS97-11
Map Scale: 1:78,947

ABSTRACT: This study estimates the availability of coal resources in the Princeton 7.5 Minute Quadrangle, Gibson County, in southwest Indiana. The tonnage of original coal in place, remaining coal after mining, and available coal resources were calculated for seven Pennsylvanian coal beds underlying the study area. In descending stratigraphic order, the seven coal beds are the Danville and Hymera Coal Members of the Dugger Formation; the Springfield and Houchin Creek Coal Members of the Petersburg Formation; the Survant Coal Member of the Linton Formation, herein referred to as the unnamed Staunton coal. The unnamed Staunton coal and the Seelyville Coal Member belong to the Raccoon Creek Group while the remaining five coals belong to the Carbondale Group. Other deeper coals are present in the quadrangle but are not considered in this report because there is insufficient information to accurately calculate resources for these coals. The original, remaining, and available coal resources are reported in terms of coal thickness, "14-28 inches," or "greater thank 28 inches", and overburden thickness "100-1000 feet." Additionally, the resources for each coal are categorized by four levels of geologic assurance or confidence. The confidence categories express the degree of confidence of finding coal at a particular location based upon the distance from a data point. The four categories are: measured (0-0.25 miles from the data point), indicated (0.25-0.75 miles), inferred (0.75-3.0 miles) and hypothetical (3.0-10.0 miles). The total volume of original resources of the seven coal beds n the Princeton Quadrangle are calculated to be 1,012 million short tons. Of the 1,012 million short tons, 64 million short tons have been removed by mining or lost in the mining process, thus leaving 948 million short tons of remaining resources. Land-use and technological restrictions remove 551 million short tons from potential mining, leaving 397 million short tons (39% of the original resources or 42% of the remaining resources) available for mining in the area.

Conolly, C. L., Krueger, A. J. 1997, The coal availability study in Indiana: Princeton 7.5 minute quadrangle: Indiana Geological Survey Open-File Study 97-11, 55 p., 3 fig.

Notes: Publications in the Indiana Geological Survey Open-File series have been inconsistently named using a variety of series titles including "Open-File Report," "Open-File Map," and "Open-File Study." Prior to 1994, a publication in this series was generally referred to as an "Open-File Report" (but not always). To help reduce confusion created by these inconsistencies, the IGS now refers to every publication in the Open-File series as an "Open-File Study." To be entirely correct in writing a bibliographic reference for a publication, one should use the series name and number that appears on the publication itself.

Final Report to the United States Geological Survey.

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Keywords: Pennsylvanian, Danville Coal Member, Hymera Coal Member, Dugger Formation, Springfield Coal Member, Houchin Creek Coal Member, Petersburg Formation, Survant Coal Member, Linton Formation, Seelyville Coal Member, Raccoon Creek Group, Carbondale Group, coal, energy resources

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