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Subsidence Evaluation for the <br />Exhibit 60E Southern Panels, Apache Rocks West, & Sunset Trail Mining Areas Page 4 <br /> <br />831-032.923 Wright Water Engineers, Inc. <br />December 2021 <br />parallel to panels E1 to E8. The mining thickness is anticipated to vary from 10 to 14 feet. The <br />overburden above panels SS1 to SS4 ranges in thickness from approximately 280 feet up to 1,300 <br />feet. <br />All longwall panels are planned to be separated by two or three rows of chain pillars. The pillars <br />on both the headgate and tailgate sides of the panels are typically on centers of about 125 feet wide <br />by 200 feet long. The headgate for the adjacent panel becomes the tailgate panel on the subsequent <br />panel. These mine plans and pillar designs may change as mining experience, geological- <br />geotechnical conditions, and/or mine operational procedures dictate. This exhibit focuses on <br />subsidence projections over the mined longwall panels.