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Item Number: OFS99-07
Map Scale: 1:1,000,000

ABSTRACT: This study assesses the resources of the Springfield Coal Member in Indiana and identifies those resources that have the most favorable geologic and land use characteristics for mining. The tonnage of original coal in place, remaining coal after mining, coal unlikely to be mined due to geologic and land use factors, and available coal resources were calculated for the Springfield Coal in Indiana. The geologic and land use factors which restrict the mining of the Springfield Coal were identified through interviews with geologists and mining engineers mining the Springfield Coal in Indiana and Illinois. These restrictions were applied to the tonnage of remaining Springfield Coal resources in order to calculate the tonnage of available resources. The original, remaining, and available coal resources are reported in terms of potential method of mining, surfaceor underground, coal thickness, 14-28 inches, 28-42 inches, or greater than 42 inches, and overburden thickness, 0-200 feet, and greater than 100 feet. Coal that lies between depths of 100 and 200 feet is considered minable by both surface and underground methods. Additionally, the resources are categorized by three levels of geologic assurance or reliability. The reliability categories express the degree of reliability of the resource estimate based on the density of coal thickness data points that are used to derive the resource estimate. The three reliability categories are: measured (0-0.5 miles from the data point), indicated (0.5-2.0 miles), and inferred (2.0-4.0 miles). The total volume of original Springfield Coal resources in Indiana is calculated to be 13.31 billion short tons. Of the 13.31 billion short tons, 1.31 billion short tons have been removed by mining or lost in the mining process, thus leaving 12.0 billion short tons of remaining Springfield resources. Technological and land use restrictions remove 4.65 billion short tons from potential mining, leaving 7.35 billion short tons (55% of the original resources or 61% of the remaining resources) available for mining in Indiana, Of the 7.35 billion short tons of total available resources, 6.94 billion tons (52% of the original resources or 95% of the total available resources) are available for underground mining, while only 0.41 billion short tons (3% of the original resources or 5% of the total available resources) are available for surface mining.

Conolly, C. L., Zlotin, A. 1999, The availability of the Springfield Coal Member for mining in Indiana: Indiana Geological Survey Open-File Study 99-07, 49 p., 18 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.

Also in CD for $35.00. CD-ROM contains added information, including Access database of all public information used to create the report.

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Keywords: coal, mine, Springfield Coal Member, Petersburg Formation, Carbondale Group

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Updated 8/19/2020