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beaver dam. The armoring of the channel bottom limits the amount <br />of vertical degradation." Finally, the magnitude of vertical <br />subsidence in this reach of Deep Creek is expected to be less than <br />that observed in previously mined areas of the West Elk Mine due to <br />an overburden depth in excess of 2,000 feet. <br />cc: Dave Berry & Dan Hernandez <br />doc: MtGlDeep.doc <br />JPiip <br />