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Fall 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />r_1 <br />LJ <br />Figure 44. Fall 2008 southward view of the landslide located west of the mouth of Box Canyon <br />The lower part of the landslide moved to the southern edge of the North Fork in multiple stages <br />during periods of high precipitation (middle foreground) Highway 133 now extends across the <br />lower part of the slide. <br />0 5.19 Traverse M-M' <br />This traverse begins at the 60rk in Colorado State Hi??hwav 133 and the Box Canyon drill read <br />and ends at MIA's 21-25.5 and 21-28. This route lies above mined Longwall Panels 18, 19, 20 <br />and 21. <br />Materials encountered along this traverse include landslide deposits near M. culluviunl. and some <br />allll?'IUIlI mixed mth collet-ium (see Maps 1 and 3). Other MDW sites located along this <br />traverse include 19-07. 19-08, and 20-21.? and 20-25. Overburden depth to the 13-seam along <br />this traverse ranges frorn about 400 feet near NI to 1.200 teet at M'. <br />Subsidence related cracking eras observed along a 200-1oot reach of the Box Canvon access road <br />(Location 14). <br />)urine the spring 2008 field visit. Photographic Observation Point 10 was established in the <br />lu\\er end of Box Canyon to observe potential effects on a series of outcropping sandstone units <br />• i, tl?? n?inin of' L.ongwall Panel 18 occurred beneath that location. This location was visited <br />831-032.790 Wright Water Engineers, Inc. Page 58 <br />December 2008