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Fall 2007 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />C7 <br />~~ <br />5.12 Location 13 (Location 19 of the Spring 2007 Field Visit) <br />Location l3 is an overhanging cliff and rockfall area near the West Elk Minc load out and stacker <br />tactltttes which were evaluated in some detail during July 2006 (see Map 1 and Figure U-10). <br />The nrlssi~ r xandstc,nc ~•lif~f~ ;uu1 ~,~ crl~in~~ Ircl,~r arr the ~;mcia~~nc that ~,vcrlic~ thr ahancl~,nrc1 <br />831-032.780 Wright Water Engineers, Inc. Page 55 <br />November 2007 <br />Figure 40. A more detailed view across Box Canyon of the active rockfall/landslide area <br />shown in Figure 39. Note at least three vertical, light-colored linear features, located <br />between main scarp and photographic observation point 1 in left background (light <br />colored sandstone ledge). These linear features may be recent cracks that would <br />indicate future spalling and slabbing failure in the area. <br />