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Figure I Generalized map of the Wilbur Mining ... - University of Utah

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1 -.—<br />

ABSTRACT<br />

Average temperature-depth gradients in wells penetrating<br />

<strong>the</strong> Mississippian Madison Limestone in<br />

Edgemont, South Dakota, are 4.7°C/I00 m, whereas<br />

<strong>the</strong> average gradient in <strong>the</strong> Black Hills area is<br />

2.6OC/100 m. Chemical analyses <strong>of</strong> ground water<br />

from forty-one Madison wells and springs were<br />

obtained to define <strong>the</strong> geochemical characteristics<br />

<strong>of</strong> <strong>the</strong> low-temperature (

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