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West Elk Mine <br />2. Box Canyon mining area <br />a. Above projected Panels 18 and 19 on the east side of Box Canyon in the N% of Section 14 <br />b. Two landslides above projected Panels 19 and 20 on the west side of Box Canyon in the <br />W% of Section 14 <br />c. Above the barrier pillars between the Box Canyon and Apache Rocks longwall mining <br />panels in the SEY4 of Section 22 <br />3. South of Divide mining area: <br />a. An extensive landslide located south of Minnesota Reservoir above the northern part of <br />projected Panel E9 in the NWY4 of Section 32 <br />A discussion regarding the monitoring plans for the landslide located on the south abutment of the <br />Monument Dam aze included in Section 2.05.6 (6)(e)(i)(D) -Detailed Description of Predicted <br />Subsidence Phenomena, Subsection "Effects Of Subsidence And Mine-Induced Seismic Activity <br />On Man-Made Structures And Renewable Resources", Monument Dam -Minnesota Reservoir. A <br />discussion concerning the preventative measures to be employed to pro$ect Monument Dam from <br />mining induced impacts is contained in Section 2.05.6(6)(f)(iv)(A-D) -Detailed Description of <br />Mitigating Measures. <br />Rock all <br />As discussed in Section 2.04.6, Geology Description, there aze exposed rock faces on steep slopes <br />where the potential for rockfall exists within the permit area. Theoretically, mining-induced changes in <br />stress and strain and fracturing could trigger additional rockfall from the many sandstone cliffs. Areas <br />of rockfall potential, such as the flanks of West Flatiron within the Apache Rocks and Box Canyon <br />permit areas are currently monitored for rockfall whether it is naturally occurring or mining-induced, <br />As with landslides, due to the scarcity of structures and limited human activity within the permit area, <br />present and future land uses will not be significantly impacted. The azea above Pane125 in Sylvester <br />Gulch has two small areas of high potential for rockfall and are depicted on Map 53B. Mining of Panel <br />25 could trigger rockfalls on the east side of Sylvester Gulch in these two small areas which could <br />result in boulders rolling downhill to the light-use roads (2) on the east side of Sylvester Gulch in <br />Section 15, however, MCC controls all access to these roads. <br />There aze no identified rockfall areas within the West Flatiron lease area, as shown on Map 1 of <br />Exhibit 60C. Therefore, any possible subsidence-induced rockfall in the West Flatiron lease area <br />should be of insignificant consequence. <br />2.05-! l4 Revised June 2005 PRl0, Rev. March 2006; Rev. Aprr12006 PRIG; May 2006 PRl0, Nav. 2006 TRl07 <br />