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TABLE ONE -BOULDER f,OUNTY <br /> SEAM OVERBURDEN <br /> DATES OF THICKNESS THICKNESS PRODUCTION UNIQUE INFORMATION <br />MINE NAME LOCATION OPERATION (IN .FEET) (IN FEET) (IN TONS) FEATURES SOURCES <br />Canfield Unknown ,NW 1890-1891(?) None reported 2,3,7,10 <br /> Sec. 13 <br /> T1S,R69W <br />Canon SW,SW,NE 1888-1892 8.0' 200,012 1,2,3,7,10 <br />(Otis) Sec. 2 1893-1898 <br /> T1S,R69W <br />Capitol SW, NE ,SW 1908-1926 5.7' 220'(?) 515,092 1,2,3,7,10 <br />(Capital) Sec. 1 <br /> T1S,R69W <br />Centennial(old)NW,SW,SW 1936-1952 1,2,3,7,10 <br />(Centennial) Sec. 16 1905-1931 5.5'-6.0' 280'+ 3,219,992 <br />(Big Four) T1S,R69W <br />Chase SE,SE,SW 1892-1894 36,052 1,2,3,7,10 <br /> Sec. 13 <br /> T1N,R69W <br />Clark No. 8 SE,SE 1900-1904 8.3' 14,793 2,3,7,10 <br />(Broadside- Sec. 16 <br />Clark #8) T1S,R70W <br />Key to unique features symbols: Z Multiple mining zones <br />* Mine opening information <br />Reclamation and/or plans -- Table two S Subsidence features <br />lists hazard abatement work F Mine fires <br />+ Discrepancy between two sources D Mine drainage <br />-11- <br />