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Predicted impact <br />Item in permit Observed impact Prediction accurate? <br /> application <br /> Maximum 18.4 ft. Between 2000 and 2007 visual <br />Vertical in two-seam mining observations were used for verifying <br /> <br />subsidence areas. Less than 1 <br />the conceptual subsidence model, <br />magnitude ft. near panel edges rather than quantitative monitoring. <br /> in single-seam The Spring 2009 report and previous The operator has completed surveys of subsidence displacements for verifying <br /> mining areas. re <br />orts included data from <br />re- the angle of draw in the E-Seam mining area. The data are not included in the <br /> p <br />p <br /> mining surveys of panel E-1 and the report, but a calculation o f angle of draw in Appendix B of the report indicates <br />Horizontal Maximum <br />thalweg of the Dry Fork of an angle of draw of 14.4/0 (Survey Station 101). This value is within the <br />displacement horizontal strain of <br />Minnesota Creek. Postmining predicted range for E Seam mining of 8 to 21 degrees. <br />magnitude 3.9% surveys will be conducted after Panel <br /> E-1 and the Dry Fork are <br />Angle of draw 8 - 21 degrees undermined. <br /> Horse Gulch Road, a USFS light use <br /> road, was undermined by the west <br /> half of Panel E-1 since the previous <br />USFS roads Rockfalls, cracking report (Fall 2009). Cracks in the Yes <br /> road are described in the Spring <br /> 2010 subsidence rport. No new <br /> rockfalls were found resulting from . <br /> previous undermining. <br /> No new undermining of USFS ponds <br />USFS ponds Draining since previous report (Fall 2009). Yes <br /> No new draining observed from <br /> revious undermining.