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V <br />�, �► t• • �► • . i . n • .. <br />HOWS 2.-•AoMANN Mine dole of. <br />formation con.isii primanl% of sandstones and shales that <br />Jip .lightly 2' to S' to the norih•notthc.ost anti are the <br />prejominant features within the (ormation. Tabular ha• <br />saltie la.a flows occur in intcnceddcd or capping ,cctions <br />A the formation and overlic most .ections oaf the mine (6) <br />The Cameo '13' Scam varies in thtcknc•. from d to 111 ft. <br />averaging 6 ft, and is presently the only Economically <br />viable scam in the %I"a.crdc Group. rill, ranging from <br />large boulders (treater than i ft in site) to fine ,and, is <br />prominent in the Cottonwood Crock Basin, No fault% hacc <br />been detected in the Roadside Mire or mapped in the <br />.turfy arca. <br />MINE PLANS <br />Coal in the study areas was mined by the room -and. <br />pillar method. Sections were developed with 211 -ft -wide <br />entries on St)- and 12041 centers. After a scakm or sub- <br />section was developed, the M. by 100 -ft pillars were then <br />retreat mined, During this process, the pillars were rained <br />with continuous miners to approximately 10 by 100 ft and <br />Ahmed in fail. Average pillar recovery was 75 pct. <br />Northwest SNOW <br />The mine plan for the northwest section is shown in fig- <br />ure 5. The study area overlay a foom.. nd•pWar section <br />approrimalck 2,tW by 1,.W ft. Five main entries were <br />driven approximately due west. The area was then retreat <br />mined from the norlhwcst. Initially, the pillar dimension. <br />were V by 111) ft on A) -ft centers. The pillars were then <br />retreat mined In a width of approximatcly 20 ft. The L• <br />.hapcd pillars near the entries were (cfl for support of the <br />entry. The harrier pillars in the entry system were <br />