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BHA <br />GROUND CONTROL PLAN <br />PER 30 CFR 77.1000 <br />AS AMENDED MAY 20, 1993 <br />Mine Name: COLOWYO MINE <br />Identification Number: 05-02962 <br />Mine Location: Parts of Sections 2, 3, 4, 9, S0, li, 15 and <br />16, T3N, R93W, 6th P.M., Moffat County, <br />Colorado, approximately 28 miles southwest of <br />Craig, Colorado, west of Highway #13, and 21 <br />miles north/northeast of Meeker, Colorado. <br />Company: COLOWYO COAL COMPANY <br />5731 State Highway 13 <br />Meeker, Colorado 81641 <br />General Characteristics of the Strata: <br />Coal is mined from a stratigraphic sequence of Upper <br />Cretaceous rocks which are in the lower part of the Williams Fork <br />formation of the Mesa Verde group. The examination of logs and <br />drill cores from Colowyo's drilling program indicates that the <br />formation consists of interbedded very light to light gray <br />sandstones, with well sorted, firmly cemented, fine to medium <br />grains. The individual beds vary from a few inches to several feet <br />in thickness, and are usually thinly crossbedded or laminated with <br />darker materials. The finer grained rocks range from highly <br />indurated medium gray siltstone to dark gray carbonaceous claystone <br />and shale. Some brackish water fossils were found in the shale <br />toward the bottom of the section. <br />Prominent jointing in the sandstone is visible on most of the <br />outcrops and where exposed in the pit. The strikes of the major <br />joint sets are usually closely parallel to and/or normal to the <br />1 <br />