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OU~ce 303 2a7-On8 <br />T0: National King Coal, Inc. <br />FRED M..~OHNSON, C.P.o. <br />• GEOIOGiST <br />P. o eox z~sz <br />DURANGO, COLORADO 81301 <br />~ ~~ ~II IIIII~II~II~~II~ <br />999 <br />July 29, 1982 <br />Fen dente 2a7-3560 <br />SU&tECT: Geotecl•~nical and Stabilit}~ Anal;~is, Proposed Backfill Confi;vra- <br />tions, King Coal Mine, La Plata County, Colorado (M.L.R.E. S'.ipu- <br />lation) <br />INTRODUCTION <br />The Colorado M.L.R,E, has requested, in mining permit no, C-o35-81 <br /> <br />dated N.arch 29, 1982, that National King Coal, Inc. prepare an appropriate <br />geotechnical and stability analysis of the proposed backfilled configura- <br />tions for the portal bench areas at the Y,ing Coal Mine, La Plata County, <br />Colorado. Such analysis shall include: <br />1) Slope stability <br />2) Material strength demonstration <br />3) Detailed geotechnical knowledge of the site <br />REQUIP,EAtENTS <br />1) Slope Stability <br />a) Stability of existing highwall cut slopes: <br />~T~ E~:~ ~ F J ~ ~_~ <br />r~u c 2 s ~ssz <br />PJIId;rD LAP!D RECLAivIAIIC~I <br />Colo. Dept. of P!atural Resources <br />The existing highwal] slopes have been mapped (geology) in detail and <br />examined for evidence of instability on a monthly basis since April 19t?2. <br />There are two existing highwall cut siones, One is located at the <br />• <br />tipple and San area, the other is the south or shop area. See Geologic Plan <br />for locations, The tipple highwall has an average slope of 1:2 and a '_ength <br />of apnroxiTSately 3~' . 15arimum height of the tipple highwall is 40' . The <br />south highwall has an average Slone of 1:1,25 and a length of approximately <br />225'. Maximum height if the south hrhwall is 40', <br />(1) <br /> <br />