2016-10-27_REVISION - C1981041 - Laserfiche WebLink

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10,000 9,000 8,000 V— 7 , o00 5,000 4,000 GRAND MESA Basalt Unnamed racks Green River Forgot; Wasatch Formollon Mesoverde Group Come* tool :one FtQura a.—Gewafted ov~don str&OVaphy. 0- 200 400 -, _--- _ - - — — — Shale Coo I Comeo "8" Seam 600 M 800 Rollins Sandstone a- �- 1,200 U Shale Moncos Tongue 1,400 ' -- Cool 1,600 "''� Cozette zone F19uro s.— *UO*d oyartturdon stratWaphy, approximately 50 by 100 ft. The depth of cover over the northwest section ranged from 100 to 200 ft; minimum overburden occurred in the northeast corner. The scam dipped 2' to 5' on a strike of N 25' F, and was considered when calculaVag overburden depths. The mining height in this area was approximately 7 ft. Southmst Section The mine plan for the southwest section is shown in figure 6. The study area overlay a room -and -pillar section approximately 700 by 1,300 ft. The initial pillar dimen- sions were 40 by 100 ft on 60 -ft centers. During develop• mcnt of the section, a subcrop was reached where weak sandstone strata and unconsolidated tits were encountered in the roof and face. The till material ranged from large basalt boulders, greater than 5 h in diam, to fine sand. The depth of cover over the section ranged from 50 to 200 ft. The minimum overburden occurred in the south• west corner. The scam was on the same dip and strike as the northwest section. The area was traversed by a 24-in-diam waterline and the main road to the Ute Water facility. Third -West Section The mine plan for the third -west section is shown in figure 7. The study area overlay two room -and -pillar sec- tions separated by a barrier pillar. The barrier pillar was approximately 60 ft wide and 2,000 ft tong. Each of the room -and -pillar sections averaged 500 by 2,000 ft. The