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MINING OFFICE 303 247-0118 <br /> EXPLORATION FRED M. JOHNSON, C.P.G. RESIDENCE 247-3560 <br /> ENGINEERING <br /> GEOLOGIST <br /> P.O. BOX 2162 <br /> DURANGO. COLORADO 81302 <br /> November 23, 1990 <br /> TO: National King Coal, Inc. <br /> SUBJECT: Stipulation No. 07, PR No. 02, <br /> File No. C-81-035 <br /> Analytical Determination of the Static Slope <br /> Safety Factor of the Coal Refuse Disposal Pile <br /> INTRODUCTION <br /> The Colorado M.L.R.D. has requested in Stipulation No. 07, <br /> PR No. 02, File No. C-81-035 Mine Permit, that National King <br /> Coal , Inc. prepare a determination of the static slope safety <br /> factor of the coal refuse disposal pile at the King Coal Mine, La <br /> Plata County, Colorado. Such determination shall include <br /> appropriate material properties as well as a static slope safety <br /> factor of 1.5. The analysis should also include: slope <br /> stability, material strength demonstration and detailed <br /> geotechnical knowledge of the site. <br /> REQUIREMENTS <br /> 1) Slope stability of the Coal Refuse Disposal Pile <br /> Characteristics: <br /> The coal refuse will be mine waste rock composed of <br /> dense, medium-grained sandstone with occasional shale and <br /> carbonaceous shale partings, all of the Menefee Formation, Mesa <br /> Verde Group, Upper Cretaceous age. <br />