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M:1 ~i1N6 <br />E %PLORATION <br />iN OIN EE RING <br /> <br />FRED M. JOHNSON. C.P.G. <br />GEOLOGIST <br />P.O. BOX 2102 <br />D URANG O, COLORADO 81302 <br />May 28, 1990 <br />TO: National King Coal, Inc. <br /> <br />OFFICE 90! 247-0110 <br />RESIDENCE 147-9300 <br />SUBJECT: Quarterly Subsidence Monitoring, Second Quarter 1990 <br />1) The second quarterly visual inspection for subsidence, King <br />Coal Mine, La Plata County, Colorado was made on several days <br />from May 8 through May 25, 1990. <br />2) No inspection was possible during the first quarter because <br />of snow cover and road conditions. <br />3) Previously reported tension fractures in surface soil in <br />the central portion of S'~ N'~ SW;, Sec. 32, T35N, RllW have ex- <br />tended westward for approximately 800'. This is the limit of <br />pillaring in Section no.3 East - no further fracturing should <br />occur in this area. The eastern portion of the fracture zone <br />is beginning to heal through filling by sediment. <br />4) Tension fractures in surface soil were noted in the SW; NE; <br />SE a, Sec. 31, T35N, R11W. No subsidence, however, was noted. <br />This fracture zone is approximately 15' wide, 400'.long and <br />trends E-W. Fractures within the zone vary in number from 2 to <br />4, are discontinuous, enechelon and vary in width from hairline <br />to approximately 0.2'. <br />5) Tension fractures occur subparallel to the southern edge <br />of Section no.l North which has been pillared. <br />(1) <br />