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1 <br />MULTI-SEAM OPEN PIT COAL MINE <br />RID WING MINE <br />CRAIG, MOFFAT COUNTY, COLORADO <br />CHAPTER PAGE <br />I INTRODUCTION <br /> A. General I-1 <br /> B. Authorization I-2 <br /> C. Purpose and Scope I-2 <br /> D. Related Reports I-3 <br /> E. Summary of Conclusions I-3 <br /> F. Limitations I-4 <br />II SITE CONDITIONS <br /> A. General II-1 <br /> B. Proposed Mine Layout II-2 <br /> C. Sections II-2 <br />III MATERIALS PROPERTIES <br /> A. General III-1 <br /> B. Properties of Foundation Materials III-2 <br /> C. Properties of Waste Dump Materials III-3 <br />' IV ENGINEERING ANALYSIS <br /> A. General IV-1 <br /> B. Stability of Waste Dumps IV-1 <br /> C. Stability of Pit Slopes IV-2 <br /> D. Stability of Dragline on Spoil Bank IV-3 <br />V CONCLUSIONS AND RECOMMENDATIONS <br /> 9. General V-1 <br /> B. Stability of Waste Dumps V-1 <br /> C. Stability of Pit Slopes V-3 <br /> D. Stability of Dragline on Spoil Bank V-3 <br />TABLES <br />TABLE OF CONTENTS <br />TABLE N0. <br />IV-1 Summary of Infinite Slope Analysis Following Page IV-2 <br />IV-2 Factors of Safety - Bearing Capacity IV-'4 <br />:V-1 Summary of Slope Angles for Waste Dumps V-2 <br />W~appWApHI~EH <br />tl A POP AiiP <br />Project 0823 <br />i <br />