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I-15 <br />• FLOOR OF UPPER WHEELER/ROOF OF LOWER WHEELER SEAMS(CONTINUED) <br />DEPTH, FT. GEOTECHNICAL DESCRIPTION <br />1042.0-1049.6 joint roughly parallel to core axis(a~0°-10°) from 1045.5' <br />to 1047.8'; rough bedding plane separations closely to <br />moderately spaced(a~55°-70°); occasional scattered low <br />angle slickensides; competent; estimated compressive strength <br />70 MPs; fair to good cavability; recovery 100X; RQD 75X; <br />Ip~617; ID~370; IpN~l.7. <br />1049.6-1058.0 CLAYSTONE and SILTSTONE: Variably interbedded; mostly medium <br />gray; very fine-grainsizes; 611ghtly friable; homogeneous <br />appearance; fairly carbonaceous; solid interval; well indurated; <br />hardness 6-7; slickensided open joint from 1049.9' to 1050.5' <br />(a~18°); several healed hairline cracks oriented OS°-10° to <br />core axis occur from 1055.8' to 1057.5'; separations with <br />occasional slickensided surfaces closely to moderately spaced <br />(a~65°-70°); fair to good competency; estimated compressive <br />strength 60 MPs; fair cavability; may provide good bolt <br />anchorage locations; recovery 100X; RQD 89X; Ip~452; ID~221; <br />IpN=2.0. <br />1058.0-1062.0 CARBONACEOUS CLAYSTONE: Dark gray to dull black; locally <br />silty; friable; homogeneous appearance; solid interval; well <br />indurated; hardness 6; minor coaly stringers and pyrite along <br />bedding planes; smooth separations along bedding planes <br />closely apaced(a~68°); fairly competent; estimated comprea- <br />slve strength 35 MPs; very good cavability; may require <br />protection from atmospheric conditions, but may form a <br />competent roof with ordinary roof support; recovery 100X; <br />RQD 33X; Ip~179; ID~73.2; IpN~2.4. <br />LOWER WHEELER COAL SEAM <br />DEPTH, FT. GEOTECHNICAL DESCRIPTION <br />1062.0-1077.4 COAL: Lower Seam; fairly clean; mostly dull; mostly broken <br />from 1062.5' to 1074.5' and mostly solid below; fairly sharp <br />broken(]) contacts; brittle; hardness 6; strong cleat set <br />oriented 0° to OS° to core axis along which most breaks <br />occur; rough breaks occur with resistance along bedding <br />planes; lost interval from 1064.7' to 1067.3'; probably strong <br />and competent; estimated compressive strength 15 MPs; recovery <br />83X; RQD 21X; Ip~134; ID~262; IpN~0.51. <br /> <br />SEEGMILLER INTERNATIONAL <br />