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Fall 2007 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />E3ear Coal mine located in the C-seam. The massive sandstone is about 40 feet thick. The <br />~~~ erlying ledges are an estimated ?5 to 30 feet thick. <br />The fall ?007 photograph shows that there has been no noticeable change since: the summer of <br />?006 (Figure -tl). ,additional details regarding this rockfall area can be found in the ?006 <br />Subsidence Report. <br />L <br />r~ <br />L~ <br />M ~'~ •~- <br />~. ,'~6 .i. ~~d~ <br />~- <br />y <br />~p <br />~y~j ~I~lr ~~~~ ~ <br />"~~~~~ _ - <br />,_, y,~' <br />,. <br />- -7GE~~ <br />'-may _. .. .~3..~ . ~„~ <br />~_ '- - . ' _ LS~ <br />1 - ~,~_~ -.~__ <br />~ f <br />Figure 42. Fall 2007 view of the overhanging cliff and rockfall area at location 13, looking south across Highway <br />133 and the North Fork. <br />831-032.780 <br />November 2007 <br />Wright Water Engineers, Inc. <br />Page 56 <br />