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Subsidence Reld Observations <br />West Elk Mine <br />August 27-29, 2002 <br />4.1.5 Traverse E-E' <br />I ravcrse Ix•gins at the tittle in drill mad to Drill Sitc 1 ~-Oi and the road w 1Vcst F IaGnat and ends <br />near the wp of the southern end of West Flatiron. <br />• Overburden depth ranges from 1,00 to 2.10(1 R alxwc the f3-Seam. <br />• I3ednxk of the l3urrcn Mcmlxr and Ohio ('reek \-(ember of the Mcsavcrdc Fatmution a»d <br />alai colluvium and soil arc encounicnd along the mud cut. <br />• \o crocks were observed slung the road cut. <br />Location I <br />Afresh hutdslide, with afoot-like shape, is located in the sandstone .md shale units of the Ohio <br />('nxk Memlxr of the Mcsttverdc Fumtation (Figuro 1). 'I'hc upper part of the landslide (scarp <br />areal is located in a sandstone lalge along tceo uls of joints. 'late lower part (ace areal a>sen <br />some Ixdrock but mostly colluvium. <br />• 'Ihc landslide occurs within the area of influence o!' mined-out longwall Paul 14 where the <br />overburden depth hi the ti-Scam is about 1.4(1(1 Il. <br />fhc landslide is estinxued to have alxtut a 7(I°io subsidence cause and a 3U% natural cause. <br />F~iRurc t. ~<Irthl`AYINArd view of fnyh-Ia~Ain1; <br />IAndaidc scArP hceatcd in the w+ndstonc end shale <br />uniu of the Ohio ('nel ~lcmher. <br />831.032.570 Wright Waler Engineers, Inc. Page 9 <br />December 2002 <br />