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1-8-80 <br />T. Hurst FIGURE S-8 (Con't) <br />PIONEER ARCHAEOLOGICAL CONSULTANTS <br />• REGARDING SUBSIDENCE EFFECTS ON ARCHAEOLOGICAL SITES . <br />The two types of mining me thods,~.longwall and room and pillar;`-._ -;. ~ . <br />,proposed for the Meeker Area Mines will cause subsidence over the area •• ' <br />to be mined. Remedial measures can be taken to prevent or minimize -_---..- _ <br />the subsidence damage anticipated, and monitoring of the. sites during;., . <br /> <br />r <br />• wi un ergo ~ eren to su si ence. r .. <br />ential-subsidence may cause tension fractures and/or tilting of the site. <br />' Sites on the interior of the mining area will undergo both tension' <br />and compression effects when mining passes through the area. The final <br />subsidence trough will show no permanent fissures or compression ridges; <br />however, the surface elevation will be lowered. Sites involved in this <br />situation will be: 5861225, 5861226, 5861227, 5RB1231, 586124.3, 5861240, <br />5881241, 5881218, 5881242, 5881219, 5881233, 5881234. <br />- ~~ <br />mining is under cons~derat~on. This mining operation.~s in an area;. ~_ .- <br />that has not historically been exploited for the mining of coal, there- <br />fore, nb data are available to accurately predict the degree of sub- .~_ ~ ' <br />sidence or subsidence damage. Damage should be minimal for most of.the'. . <br />sites due to the depth of overburden and the full extraction mining :_~ ... ~i <br />methods to be employed...' - - <br />.Sites along state highway 13 may experience some tension cracking. ..:. - <br />These sites are near barrier pillars to protect the integrity of state. ~. .:.;~.; <br />,highway 13.` These barriers will cause differenti.a7 movement which -.:.~. ~`` <br />'.,±: <br />leads to tension cracking. These sites can be identified by the index- <br />. numbers, 5881238, 5861237, 5RB1230, 5861224, 5861223, 5881236, and '.~ <br />. ~ ~- <br />5Rd1228. .- , ~ _ .. ~ ., . - ~ - <br />_ '~... . <br />Sites north of the mining activity, 5861220, 5861221•, SRB1222, and ~~ <br />5861235, should be free of any effects of mining because they are beyond. ~ _. - - <br />the predicted angle of draw of the subsidence trough...-_. ... - _ <br />Sites along the edge of the subsidence trough, Historic Cabin;'°:=~• ~~.: ~_ <br />5881232 5881230 •11 d d'ff t' 1~ b 'd~ Thus diffe - <br />• 5-23 <br />i <br />