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Revision <br />February 1982 <br />' ~ Location of the fracture systems in the roof of the mine coincide with <br />the overlying ephemeral gulches. Dunrud (1976) concluded that these <br />gulches had formed in fracture systems which eroded more easily than the <br />surrounding rock. Water has seeped into the mine from these fracture <br />systems mainly during the snowmelt season. The water is an alkaline <br />sodium-bicarbonate type averaging 5959 mg/1 total dissolved solids. This <br />is typical for the sandstones of the Mesaverde Formation. Therefore, it <br />• <br />• <br />2.04-246' <br />_. _ . w'~..:~:' }- _~. mar: z'd ._.. _ -- - - - - <br /> <br />