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I-10 <br />• LOWER WHEELER SEAM COAL(CONTINUED) <br />DEPTH. FT. GEOTECHNICAL DESCRIPTION <br />1563.7-1585.8 vitreous and locally bright; trace calcite along cleat <br />surfaces; broken intervals: 1563.7' to 1565.7'. 1570.3' <br />to 1471.0', 1579.0' to 1580.8' and from 1584.3' to 1585.6' <br />inclusive of lost intervals which occur within broken zones; <br />hardness 6; sharp brokea(7) contacts; strong cleat set <br />oriented 25° to 35° to core axis very closely spaced along <br />which coal divides easily; some tendency to divide along <br />bedding planes; intervals lost: 1564.5' to 1565.0', 1569.7' <br />to 1570.3' and 1579.7' to 1580.6'; competent; estimated <br />compressive strength 20 2D?a; recovery 91X; RQD 45X; Ip~93; <br />ID~97; IpN~1.0. <br />FLOOR OF LOWER WHEELER SEAM <br />DEPTH. FT. GEOTECHNICAL DESCRIPTION <br />1565.8-1587.0 CARBONACEOUS CLAYSTONE: Dark gray; silty content increasing <br />• downwards; laminated bedding; thin coaly stringers; solid <br />interval; very well indurated; hardness 6; smooth clean open <br />joint surface at 1586.8'(a~18°); smooth bedding plane separa- <br />tions closely apaced(a~65°); slickensided bedding plane at <br />1586.7'; fairly competent; estimated compressive strength <br />40 MPs; fairly good bearing capacity; recovery 100X; RQD 46X; <br />Ip-308; ID~242; IpN~1.3. <br />1587.0-1591.6 SANDSTONE: Tan; fine-grained; faintly bedded; occasional <br />thin carbonaceous stringers; solid interval; very well <br />indurated; hardness 8; fairly rough tight joints with trace <br />calcite infilling located at 1586.0'(a~15°), 1590.8'(a~20°), <br />and 1591.3'(a~0°-OS°); trace elickenaides at 1588.3'(a~45°) <br />and at 1589.0'(a~85°); coaly bedding separations closely <br />spaced(a~60°-70°); silty carbonaceous interval 1588.3' to <br />1589.0'; very competent; estimated compressive strength 100 psi; <br />excellent bearing capacity; recovery 100X; RQD 73X; Ip-1450; <br />ID-819; Ipp~~1.8. <br />1591.6-1593.5 BONE COAL: Carbonaceous silty claystone near contacts; <br />dark gray; dull; banded; broken from 1592.5' to 1593.2'; <br />yell indurated; hardness 6; no cleats or joints; smooth <br />separatlons closely to very closely spaced(a~60°-70°); <br />C 1 <br />SEEGMILLER INTERNATIONAL <br />