PERMFILE69629

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 2/28/2006
• Section_Exhibit Name: Tab 06 Geology and Overburden Assessment
• Media Type: D
• Archive: No

• The core samples were described in the field by the driller and subsequently by a
hydrogeologist. Standard geologic description information such as lithology, color,
hardness, grain size, boundary Conditions, wetness, and presence of fractures, pyrites,
gypsum, and carbonates were included. The lithology for these core holes is presented in
Appendix 6-1. The cores were packaged in 6 mil polyethylene by two-foot increments and
placed in standardized boxes for shipment to the lab. Once ell cores were drilled,
sampled, described, and boxed, they were shipped by truck to Peabody Central Lab in
Freeburg, Illinois.
Semolina Meth odolocv - Phase I1. A Phase II drilling program was implemented in July 1991
to assess and confirm the extent of suitable, marginally suitable, and unsuitable materiel
and to meet CMLRD hole density requirements. Drill hole descriptions, chemical analyses,
and textural analysis data from Phase 1 sampling indicate minimal Lateral variability in
the local depositional environment.
Wedge overburden lithology within the Toast study area is very similar to the Wedge mining
area et Seneca II end II-W Mines. Fine sandstone and siltstone are dominant in the 50- [o
6D-foot thick ove rburden section between the lennox and Wedge coal seams. A thin 1.5-foot
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Lennox coal seam is capped by a five-foot thick herd sandstone strata. More than 75 feet
of shale and clay overlie this sandstone strata.
Wolf Creek overburden lithology in the southeastern corner of the Yoast study area is
similar to the Wolf Creek mining area at Seneca 11 Mine. Gray to dark gray stratified
shale and fine grained sandy siltstone are dominant in the overburden section. Acid, gray
shale strata with a high iron level occurs from 20 to 35 feet above the top of the Wolf
Creek coal seam.
Based upon the low variability, Peabody selected and CNLRD approved four Phase lI
overburden holes to provide a more uniform density of sample sites across the Wedge coal
recovery area, sample thicknesses of overburden (40, 50, 60, end 110 feet) not included in
the earlier Phase I sampling, test for constituents not included on the Phase 1 parameter
list, and confirm the extents of unsuitable constituents identified by the Phase 1
drilling program. The lennox coal seem was sampled at the thickest overburden site. The
combined Phase 1 end Phase II sampling intensity is 1 hole/35 acres. Survey information
~• for these four sites is listed in Table 2. The locations of these holes ere shown on
Exhibit 6-4.
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