ABSTRACT: This study estimates the availability of coal resources in the Switz City 7.5 Minute Quadrangle, Greene County, in southwest Indiana. The tonnage of original coal in place remaining coal after mining, and available coal resources were calculated for five Pennsylvanian coal beds underlying the study area. In descending statigraphic order, the five coal beds are the Marshall (upper and lower benches), Upper Block, and Lower Block Coal Members of the Brazil Formation, and an unnamed coal within the Mansfield Formation, herein referred to as the unnamed Mansfield coal. All five coal beds belong to the Raccoon Creek Group. Other deeper and shallower 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 than 28 inches," and overburden thickness, "0-2000 feet" and "200-1000 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 five coal beds in the Switz City Quadrangle are calculated to be 247 million short tons. Of the 247 million short tons, 32 million short tons have been removed by mining or lost in the mining process, thus leaving 215 million short tons of remaining resources. Land-use and technological restrictions remove 16 million short tons from potential mining, leaving 199 million short tons (80% of the original resources or 92% of the remaining resources) available for mining in the area.
Conolly, C. L., Krueger, A. J. 1998, The coal availability study in Indiana: Switz City 7.5 minute quadrangle: Indiana Geological Survey Open-File Study 98-03, 35 p., 18 fig., 1 pl.
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, Marshall Coal Member, Upper Block Coal Member, Lower Block Coal Member, Brazil Formation, Mansfield Formation, Raccoon Creek Group, coal, energy resources
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