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MIMING • • <br />E%PLORATION FRED M. JOHNSON. C.P.G. <br />ENGINEERING ~.EOLOGIST <br />P.O. BO% 2162 <br />DURANG O. COLORADO 81302 <br />October 9, 1989 <br />TU: National King Coal, Inc. <br />OPFICC ]O] ]~l'OI1G <br />RESIDENCE 2~1~]]a0 <br />SUBJECT: Quarterl}~ Subsidence Monitoring, Fourth Quarter 1989 <br />1) The fourth quarterly visual inspection for subsidence, King <br />Coal Mine, La Plata Count}~, Colorado was made on October 6, 1989. <br />2) Tension fractures in surface soil were noted in the central <br />portion of S~ N'~ SW;, Section 32, T35N, R11W. No subsidence, <br />however, was noted. <br />3) Tension fractures occur subparallel to the northern edge of <br />3 East which has been pillared. <br />4) Two survey points were located above 3 East i.'ith a control <br />point above unmined ground between 2 East and 3 East, for <br />survey monitoring. <br />The surface above both old and current workinos was ir.- <br />spected. Recent tension fractures in soil, which occurred since <br />the inspection of 9/18/89, were noted in the central portion <br />of Sj N'~ SW~ Section 32. There are three subparallel fractures <br />which strike near E-W. The northernmost fracture is appro};i- <br />mately 311' in length, discontinuous and varies in width from <br />a hairline fracture to 0.2'. The central fracture lies aoDrox- <br />imately 38' south, is approximately 270' in length, discontin- <br />uous and also varies in c,~idth from a hairline fracture to 0.2'. <br />(1) <br /> <br />