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' CHAPTER I INTRODUCTION A. GENERAL This report presents the results of W. A. Wahler and Associates preliminary ' design of the waste dumps at the proposed Red Wing Mine near Craig, Colorado (see Figure I-1). Also included are results of the field and laboratory ' investigations performed in order to adequately define the site conditions and materials properties used in evaluation and design. ' Waste overburden materials from the initial pit slope cuts at the Red Wing ' Mine must be stockpiled indefinitely, on-land, adjacent to the pit. This report, therefore, investigates the stability of these waste dumps for various geometric configurations such as slope angle, height, foundation inclination, and proximity to the pit slopes. "Pseudo-static" methods of analysis were also used to evaluate the stability of the dumps during earthquakes or during ' mine blasting. ' As the mining operation progresses, the additional overburden material will be wasted inside the mine on the opposite side of the pit from the high- ' wall side where the coal will actively be mined. Handling of these over- burden materials inside the pit will require positioning of a dragline at the crest of the spoil bank. This report, therefore, also investigates the working location of that dragline and how it may effect the overall stability of the slope atop which it will sit. It should be noted that the mining plan for the Ring Wing Mine is in its preliminary stages only, and exact details of the mine location and con- figuration are not yet known. Sketches and Sections used in the report, and for the purpose of analysis, are only conceptual and probably do not completely represent the complex set of conditions that will exist every- ' where at the mine site. In view of that fact, this report represents preliminary design and design recommendations for a variety of possible conditions. Final evaluation, however, may require extrapolation WAWRNLER Project 0823 I-1 & ASSOCIQI~S