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CL.IMAY MOLYBDENUM COMPANY <br />, S..ob ..a . _ P-r.o% :laogr %1-na <br />April 1 1 . 2000 <br />.Mr_ Sntce Humphries <br />Colorado Division of'Minerals and Geology <br />1313 Sherman Street. Room 1 <br />Denver Colorado 80203 <br />RE_ Technical Revision TR-0q <br />Chanue to Environmental Protection Facility <br />Dew, Mr. Humphries: <br />Henderson operatipns <br />Z(F qC <br />,r.p re .--icraon 9: •.?9 <br />=ax '-331569 ' SAC <br />The Henderson Mine is planning to chance portions of an existing Environmental <br />Protection Facility (EPF). These changes will be to the decant system for Dams No. <br />and 3 (hereafter referred to as No. 3 decant system) and the Dam No. 3 scepwater <br />collection and pumpback system. <br />Dam No. a' is one of three to ilin?al dams at the Henderson Mill Site. Eventually. Darr No, <br />will be covered with tailing and Dams No. I and No. 3 will form one dam as the <br />ultimate proposed crest elevation of 3900' is approached. Cttrrcntly. Dam No. l crest <br />elevation is an elevation of approximately 8810 and Dam No.3 crest elevation is <br />approximately 8828. <br />Darn No. 3 is not currently being used for tailing deposition and is hydrauiicall' <br />separated from tailing deposition at Dam No. 1 by Dam No. ?. Henderson plans it) <br />resume tailing deposition at Dam No. 1 in ?002. <br />Decant System <br />The Darn No. ? decant system, which is no ionger in use, has been inundated by Dam No. <br />3. Decant To\ver SN is located on the face of Data No. 3. Sze Drawing 501-531. <br />Seepage of about 10 gpm has been observed emanating from Decant Tower 5N and is <br />currently being collected and managed in the Dam No. _i scepwater col?ectiun sand <br />puntpback system. It appears that the hydrostatic level of the decant system is <br />sufficiently high to have caused the flow to reverse in the decant system. The source 01, <br />the water emanating from Decant Tower aN is unknown. However. the most likely <br />sources are zither inflow into the decant system along the length of the decant line: or <br />z <br />cW <br />C <br />U <br />Q <br />a