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4. Stabilit7: The revised design o! the refuse diepoeal area <br />included a stability analysis utilizing the same methods sad <br />(~'.: <br />references that were used in the initial design, except that <br />actual physical properties of the refuse material, based upon <br />testing conducted early is the mine life, were utilized. The <br />calculated factor of safety !or the revised refuse disposal <br />embaalonent utilizing actual physical parameters of the refuse <br />material is 2.45. Like in the initial design, a sensitivity <br />analysis was conducted by varying cohesions, internal angles <br />of friction, and the overall elope of the embanl~eat. The <br />sensitivity analysis resulted in factors of safety ranging <br />from 1.55 to 2.4b, indicating that all possible variations <br />sad conditions for the design would result is a !actor of <br />safety greater than the required 1.5. <br />The Division approved the modified refuse disposal area design <br />with three stipulations, none of which were satisfied by the <br />previous operator. <br />Flaws in Previous Deaiaae <br />During early 1987, Energy Fuels 1[ining Company acquired the <br />Raton Creek Mine pro j set from the previous operator . Based on <br />observations of the then ezieting refuse disposal area, it was <br />evident that modiiicatione were necessary in order to improve the <br />operational feasibility of embanl®ent construction, drainage <br />control, reclamation tessibility, and to match the refuse <br />disposal design volume with that which is ezpected to be gener- <br />ated during the mine lice. The following is a list o! design <br />flaws which were idantilied in the initial and revised designs <br />and which are being corrected in the design presented here: <br />i. The volume of refuse diepoeal contemplated in the 1983 <br />modified design ie approzimately 4 million cubic yards, sour <br />times greater than that which is neceaasry. <br /> <br />486 <br />Revised 5/93 <br />