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DATES OF <br />MINE NAME LOCATION OPERATION <br />Ketchum & SW,SW <br />Murphy Sec. 32 <br /> T4S,R69W <br />Kojac Unknown 1931 <br />Leyden C,S/2 1903-1910 <br />(Leyden Sec. 26 1912-1917 <br />Nos. 1 & 2) T2S,R70W <br /> Also Sec. 27 <br />Leyden SE,SW,SE and 1912-1913 <br />No. 3 W/2,NE,SW 1919-1950 <br /> Sec. 27 <br /> T2S R70W <br />Littleton W 1/2 1933-1934 <br />(Christensen) Sec. 27 1922-1932 <br /> T5S R69W <br />Mann SW,NW,NW <br /> Sec. 31 <br /> R4S,R69W <br />Morrison Unknown 1908 <br /> Sec. 23 <br /> T4S,R70W <br />Key to uniqu e features symb ols: <br />Reclamation and/or plans -- Table Two <br />lists hazard abatement work <br />+ Discrepancy between two sources <br />TABLE ONE -JEFFERSON COUNTY <br />SEAM OVERBURDEN <br />THICKNESS THICKNESS PRODUCTION <br />(IN FEET) (IN FEET) (IN TONS) <br />None <br />reported <br />60 <br />7.0'-9.0' 660'-800' 2,057,549 <br />7.0'-9.0' 700'-800' 3,722,344 <br />UNIQUE <br />FEATURES <br />6.0-8.0' 490' + 91,197 S, Reclamation <br />None <br />reported <br />15.5' 850 <br />Z Multiple mining zones <br />* Mine opening information <br />S Subsidence features <br />F Mine Fires <br />D Mine Drainage <br />S <br />INFORMATION <br />SOURCES <br />1,2,7,9 <br />1,3,7,10 <br />1,2,3,7,10 <br />1,2,3,7,10 <br />1,2,3,5,7,10 <br />1,2,7,9 <br />1,3,7,10 <br />-10- <br />