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Subsidence Fiord Observations <br />West Elk Mine <br />August 27-29.2002 <br />• "I he cracks am located where the top of West Flatiron harrows northward liom atwut 2.000 ft <br />wide to 200 l0 25(1 fl wide. <br />r 1-his sudden, northward a>m~ergencc may cause increased lateral stress. <br />~ 17tis lateral movement may he the initial stage of landslide scarp development. <br />Tension fractures along joints ncetr clill' outcrops, caused by lateral movement towards the <br />c1ilTf:rcc, look like subsidrncc-induced features (J=igurcs 4 and 5), <br />Figures 4 and 5. Tension cracks along Joints near the <br />oast-facing cliffs of West Flatiron look Ilke <br />aubeidonce-induced cracks. <br />831-032.570 Wright Waler Engineers. Inc Page 12 <br />December 2002 <br />Figurn 3. Tenalon cracks located In clay of the Wasatch <br />Formation. Cracks are as much as 3.5 Inches wide and <br />150 N long. <br />