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TABLE TWO -- JEFFERSON COUNTY <br />MINE NAME COMMENTS ON FEATURES <br />Tindall S: Subsidence pits. Largest pit is 20' long, 15' wide, and 2'-3' deep and is due to collapse <br /> over main shaft. Two smaller pits 10' in diameter and 2'-3' deep may mark an air shaft <br /> and room. A large excavation in this area has been dug for use as a trash pit and is not <br /> a subsidence feature. <br />Unknown No. 1 S: Reclaimed area. Subsidence pit observed in 1977 was 20' across and 3'-4' deep. Pit may <br /> have been a shaft. <br />Unknown No. 2 S: <br />and No <br />3 Reclaimed area. In 1976 the incline of this mine was marked by a subsidence trench <br />' <br />' <br />. 30 <br />-40 <br />long, 10' wide and 2'-5' deep; Feature was obliterated during construction of <br /> Mt. Carbon Dam. <br />Unknown No. 4 S: Subsidence pit clusters (four groups). Pits are 5'-10' across and 2'-3' deep. They may be <br /> They may instead be prospect pits. Public records do not show a mine in this area <br />but the <br /> , <br />but the records are not always complete. <br />Van Winkle Z: Working three levels (reference 2). <br />Virginia The Virginia Mine project reclamation consists of two elements: the first is an analysis <br /> of subsidence risk (which has been completed in 1982 by AML). The second involves the <br /> installation of a subsidence monitoring grid, completed 1983. <br />Wheeler S: Subsidence pit. A pit 30' in diameter and 6' deep marks the probable location of the <br /> shaft of the Wheeler Mine. <br />*: Horizontal opening. Opening is cut into massive sandstone cliff and is adjacent to shaft <br /> of Wheeler Mine. Entry is 4' wide, 5' high; opening only goes about 7' into cliff <br /> . <br />Little danger of collapse. No access deterrent. <br />Williamson S: Subsidence pit (?) -- Pit is 18' in diameter, 3'-5' deep and is on strike with the min <br /> e <br />adit which lies down slope. Feature may be a prospect pit rather than a subsidence pit. <br />Key to unique features symbols: Z Multiple mining zones <br /> <br />Reclamation and/or * Mine opening information <br />plans -- Table Two S Subsidence features <br />lists hazard abatement work F Mine fires <br />+ Discrepancy between two sources D Mine drainage -21- <br />