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2005 Subsidence and Geologic Field Observations <br />Box Canyon, W est Flatiron, Apache Rocks, <br />and South of Divide Mining Areas <br />4.12 Traverse K-K' <br />Traverse K-K' begins at Location 9 (stock pond P23-4), thence to MDWs 22-02 and 22-02b, and <br />ends at MDW 23-03. The traverse is above the eastern parts of mined longwal] pane122 and the <br />northeastern part of un-mined longwal] panel 23, where the overburden depth to the B-Seam <br />ranges from 2,200 to 2,250 feet. <br />Light gray to light brown soil, colluvium, and local siltstone and claystone outcrops of the <br />Wasatch Formation and the Ohio Creek Member of the Mesaverde Formation were observed in <br />the traverse. No subsidence Features were observed. <br />4.12.1 Location 12 <br />Rockfall north of the main road to West Flatiron, observed and photographed east across the <br />draw at the same location as in July 2004 (Figure 13). Location 12 is along Traverse I-I'. <br />The rockfall is observed and photographed again this year to determine whether any changes <br />have occurred during the past year. The rockfall, which occurred on June 30 2004, is located <br />above the north central part of longwal] panel 14. The longwal] panel was mined about 3 years <br />ago. Subsidence processes were expected to be complete two years prior to the occurrence of the <br />rockfall, however, the mining probably had an impact on this rockfall, in view of the steep slopes <br />and rugged cliff topography. <br />831-032.710 Wright Water Engineers, Inc. Page 27 <br />November 2005 <br />