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I-16 <br />• FI AfIR OF LOWER WHEELEk SEAM <br />DEPTH, FT. GEOTECHNICAL DESCRIPTION <br />1077.4-1078.0 CARBONACEOUS CLAYSTONE: Dark gray to black; thinly bedded; <br />generally coaly; solid interval; well indurated; hardness 6-7; <br />smooth separations along bedding planes closely epaced(a=58°); <br />occasional slickensides along bedding planes; competent; <br />estimated compressive strength 35 MPs; fair bearing capacity; <br />recovery 100X; RQD OX; Ip=170; ID=78.0; I~ 2.2. <br />1078.0-1080.2 CLAYSTONE: Medium gray; silty content increasing downwards; <br />thinly bedded; slightly friable; scattered thin coaly <br />stringers and generally carbonaceous; solid interval; well <br />indurated; hardness 6-7; rough separations closely spaced <br />(a=65°); competent; estimated compressive strength 65 MPs; <br />good bearing capacity; recovery 100X; RQD 80X; Ip=277; <br />ID=123; Ipp=2.3. <br />1080.2-1094.0 SILTSTONE: Mudstone composition; light gray; occasional <br />sandy lenses; nearly homogeneous appearance; minor scattered <br />carbonaceous debris; solid interval; well indurated; hardness <br />7; smooth clean open joint from 1089.4' to 1090.6'(n=10°); <br />• rough bedding plane separations closely to moderately <br />apaced(a=70°-75°); very competent; estimated compressive <br />strength 90 MPs; recovery 100X; RQD 91X; Ip=730; ID 415; <br />Ipp=1.8. <br /> <br />SEEGMILI Fp INTENNATIONAL <br />