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I-9 STORM KING MINES - HOLE No. 3,75 ROOF OF UPPER WHEELER SEAM DEPTH, FT, GEOTECHNICAL DESCRIPTION 1495.0-1523.9 SANDSTONE: Locally silty and containing thin carbonaceous interbeds; alternatingly tan and dark gray; generally fine- grained; considerable thin carbonaceous clayey stringers; solid interval; very well indurated; hardness 7; numerous fairly smooth tight healed joints with thin calcite infill- ing material are spaced and occur at: 1509.2'(a~23°), 1511.1'(a~12°), 1511.3'(a~12°), 1511.4'(a~10°), 1512.2' (a~26°), 1516.9'(a~17°), 1517.3'(a~22°), 1517.7'(a~ll°), and 1522.7'(a~13°); rare low angle slickensides occur where clayey at 1516.7' and along carbonaceous clayey bedding planes at 1522.0'; smooth bedding plane separations moderately to widely spaced(a~{i5°*_OS°); competent; estimated compressive strength BO MPs; fair cavability; recovery 100%; RQD 95X; Ip~905; ID~374; Ipp~2.4. 1523.9-1529.0 SANDSTONE: Mostly tan; fine to medium-grained; occasional thin carbonaceous stringers: solid; well indurated; hardness 7; smooth tight healed joints with calcite infilling material occur ai 1524.3'(a~20°) and at 1526.3'(a~14°); smooth bed- ding plane separations closely to moderately spaced(a~65°± OS°); competent; estimated compressive strength 70 MPs; fair to good cavability; stable strong immediate roof will provide good bolt anchorage; recovery 100X; RQD 91X; Ip~988; ID~454; IpN~2.2. 1529.0-1529.6 SILTSTONE: Thin interbedded sandy :ones; mostly dark gray; fine-grained to clayey; subfriable; solid interval; generally carbonaceous and local thin coaly beds; well indurated; hard- ness 7; smooth tight discontinuous joint at 1529.4'(a~15°); separations along coaly bedding planes very closely to closely spaced(a~60°); sharp broken contact with coal; com- petent; estimated compressive strength 50 MPs; may stand well in roof, but may slab-off if exposed with no artificial support; recovery 100X; RQD 67X(?); Ip~693; ID~195; IpNs3.6. • $EEGMILLER INTERNATIONAL