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and Asso~lales, LC <br />• fractures measured in the lease area are sub-vertical (very near 90°). However, about 30% of <br />the measured fractures dip 60°to 85°. <br />During underground mine development, five northeast trending tectonic faults in the East <br />Main workings of the B-Seam have been mapped by MCC. Dunrud (1989) also identified <br />several northeast [o northwest trending dip-slip faults of minor displacement, although these <br />were not encountered in the subsurface at the B-Seam level. <br /> <br />• <br />Characterization of Groundwater Systems in the V icinity of the West Elk Mine, Somerset, Colorado <br />29 January 1999 <br />Paee 22 <br />