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Spring 2011 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />• Dunrud, C. Richard, et al. 1996. Exhibit 60A: Subsidence Evaluation of the Revised Mine Panel <br />Layouts in Section 21 and Sections 26 and 27. Denver, CO: Wright Water Engineers, Inc. <br />1998 rev. Exhibit 60: Subsidence Evaluation for the Apache Rock Mining Area and Box <br />Canyon Lease Tract. Denver, CO: Wright Water Engineers, Inc. <br />2006 rev. Exhibit 60B: Subsidence Evaluation for the South of Divide Mining Area. <br />Glenwood Springs, CO: Wright Water Engineers, Inc. <br />Dunrud, C. R. and F. W. Osterwald. 1980. Effects of Coal Mine Subsidence in the Sheridan, <br />Wyoming Area. U.S. Geological Survey Professional Paper 1164. Denver, CO: U.S. <br />Geological Survey. <br />Dunrud, C. R. and G. D. Witt. 2007a. Spring 2007 Subsidence and Geologic Field Observations <br />Box Canyon, West Flatiron, Apache Rocks, and South of Divide Mining Areas. Denver, <br />CO: Wright Water Engineers, Inc. <br />2007b. Fall 2007 Subsidence and Geologic Field Observations Box Canyon, West <br />Flatiron, Apache Rocks, and South of Divide Mining Areas. Denver, CO: Wright Water <br />Engineers, Inc. <br />• <br />• <br />Liu, T. Q. 1981. Surface Movements Overburden Failure and its Application. Co, China: Coal <br />Industry Publishing. (in Chinese). <br />National Coal Board. 1975. Subsidence Engineers' Handbook. National Coal Board, United <br />Kingdom, Mining Department. <br />Peng, S.S. 1992. Surface Subsidence Engineering. Littleton, CO: Society for Mining, <br />Metallurgy, and Exploration. <br />Peng, S.S. and D.Y. Geng. 1982. Methods of Predicting the Subsidence Factors, Angle of Draw <br />and Angle of Critical Deformation. Proceedings of State-of-the-Art of Ground Control in <br />Longwall Mining and Mining Subsidence Conference. New York: Society of Mining <br />Engineers of the American Institute of Mining. <br />Tetra Tech. 2007. Exhibit 60E: Subsidence Evaluation for the South of Divide and Dry Fork <br />Mining Areas. Missoula, MT: Tetra Tech. Revised Wright Water Engineers, Inc., <br />February 2011. <br />Wardell, K. 1971. The effects of mineral and other underground excavations on the overlying <br />ground surface. In Symposium [on] geological and geographical problems of areas of <br />high population density, Washington, DC, 1970, Proceedings, 201 -217. Denver, CO: <br />Association of Engineering Geologists. <br />831 - 032.793 <br />September 2011 <br />Wright Water Engineers, Inc. Page 48 <br />