Browsing Presentations - Indiana Geol. Survey by Author "Branam, Tracy"

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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 ...

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