Laserfiche WebLink
Subsidence and Geologic Field Observations <br />Apache Rocks and Box Canyon Mining Areas <br />July 12-15. 2004 <br />Phis is another observation point to obtain an image of the arw of mining influence of the <br />Box Canyon longwall p:mcls 18 and 10 and of the West Flatiron lxau arw (Figure 7). <br />Figure 7. Northward view of the Wesl Flatiron Lease. The left side of image Is Iha approximate boundary <br />between the Box Canyon mining area end the West Flatiron Lease. Natural rocklall potentlal Is high for <br />the first 200 to 300 feet within and beneath the massive sandstone cliffs and ledges. <br />The natural rockfall potential is high for the first 200 to 300 feet within and bcuwth the <br />massive sandstone cliff outcrops. The rockfall pWCntial is estimated to ba low to moderato <br />on the more gentle slopes to the east (such as in the area in the right center of image in <br />Figure 7j. <br />• The potential may increase somewhat when the area is mined, however little or no etTects <br />were observed on cliff' outcrops above the longwall panels that have been already mined to <br />the south on Wcst Flauron. <br />a3r•032.640 Wright Water Enyinears, inc. Papa 17 <br />September 2004 <br />