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PERMFILE40511
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PERMFILE40511
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Last modified
8/24/2016 10:43:26 PM
Creation date
11/20/2007 10:22:14 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1994082A
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
TAB 6 GEOLOGY AND OVERBURDEN ASSESSMENT
Media Type
D
Archive
Yes
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• The core samples were described in the field by the driller and subsequently by a <br />hydrogeologist. Standard geologic description information such as lithology, color, <br />hardness, grain size, boundary Conditions, wetness, and presence of fractures, pyrites, <br />gypsum, and carbonates were included. The lithology for these core holes is presented in <br />Appendix 6-1. The cores were packaged in 6 mil polyethylene by two-foot increments and <br />placed in standardized boxes for shipment to the lab. Once ell cores were drilled, <br />sampled, described, and boxed, they were shipped by truck to Peabody Central Lab in <br />Freeburg, Illinois. <br />Semolina Meth odolocv - Phase I1. A Phase II drilling program was implemented in July 1991 <br />to assess and confirm the extent of suitable, marginally suitable, and unsuitable material <br />and to meet CMLRD hole density requirements. Drill hole descriptions, chemical analyses, <br />and textural analysis data from Phase 1 sampling indicate minimal Lateral variability in <br />the local depositional environment. <br />Wedge overburden lithology within the Toast study area is very similar to the Wedge mining <br />area et Seneca II end II-W Mines. Fine sandstone and siltstone are dominant in the 50- to <br />6D-foot thick overburden section between the Lennox and Wedge coal seams. A thin 1.5-foot <br />• thick shale zone occurs directly above the Wedge coal seam. The five- to six-foot thick <br />Lennox coal seam is capped by a five-foot thick herd sandstone strata. More than 75 feet <br />of shale and clay overlie this sandstone strata. <br />Wolf Creek overburden lithology in the southeastern corner of the Yoast study area is <br />similar to the Wolf Creek mining area at Seneca 11 Mine. Gray to dark gray stratified <br />shale and fine grained sandy siltstone are dominant in the overburden section. Acid, gray <br />shale strata with a high iron level occurs from 20 to 35 feet above the top of the Wolf <br />Creek coal seam. <br />Based upon the low variability, Peabody selected and CNLRD approved four Phase lI <br />overburden holes to provide a more uniform density of sample sites across the Wedge coal <br />recovery area, sample thicknesses of overburden (40, 50, 60, end 110 feet) not included in <br />the earlier Phase I sampling, test for constituents not included on the Phase 1 parameter <br />list, and confirm the extents of unsuitable constituents identified by the Phase 1 <br />drilling program. The Lennox coal seem was sampled at the thickest overburden site. The <br />combined Phase 1 end Phase II sampling intensity is 1 hole/35 acres. Survey information <br />~• for these four sites is listed in Table 2. The locations of these holes ere shown on <br />Exhibit 6-4. <br />15 <br />
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