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/ — MINE DRAINAGE <br /> "ter 0 1. m <br /> e L <br /> o ' <br /> ' \ f:__ KOEHLER PORTAL ( CAVED ) � <br /> Z <br /> m <br /> l O Z <br /> ` r <br /> ' o< OOLD <br /> II 1 N <br /> \i 'COR►OKATION KOEHLER MINE SITE <br /> SCALE : I IN. . 40 FT. <br /> l' SIL%MRTONa,C0L0RA00 <br />