Browsing Presentations - Indiana Geol. Survey by Author "Harper, Denver"

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  • Harper, Denver; Branam, Tracy (2010-03-11)
    Since the nineteenth century, more than 2.2 billion metric tons (2.4 billion short tons) of coal have been extracted from underground and surface mines of Indiana, directly affecting approximately 2,000 square kilometers ...
  • Harper, Denver; Branam, Tracy; Shaffer, Nelson R. (2009-12-08)
    Almost 200,000 acres of Indiana are underlain by abandoned underground coal mines. Many of the voids are filled with water, representing a high-yield aquifer that may contain 170 billion gallons or more. Since 1984, the ...
  • Harper, Denver; Dintaman, Chris; Zlotin, Alex (2008-02-19)
    The Indiana Geological Survey (IGS) has created an interactive map ( to facilitate the identification and retrieval of historical aerial photographs (HAPs). Large-format photomosaic index maps ...
  • Harper, Denver; Dintaman, Chris; Mastalerz, Maria; Letsinger, Sally (2008-12-09)
    Coal-slurry deposits (CSDs) are deposits of fine-grained refuse from coal-preparation plants. CSDs were mapped and their volumes were estimated using historical aerial photographs, geological records, and geographic ...

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