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COLOWYO COAL COMPANY REVISED OCTOBER 2003 <br />2003 - TR - 56 <br />Dozer Production West Pit <br />SPOIL DOZER PRODUCTION <br />EQUIPMENT REQUIRED <br />-CATERPILLAR D10N DOZER <br />DOZING PRODUCTION <br />DOZING DISTANCE 250 FT <br />GRADE -20 <br />BLADE TYPE SU <br />MATERIAL DENSITY 2250 LCY <br />PRODUCTION 660 LCY/SCH HR <br />GRADE FACTOR 1.42 <br />SLOT DOZING 1.2 <br />MATERIAL 1 <br />VISIBILITY 1 <br />ALTITUDE 0.96 <br />SPOIL FACTOR 0.8 <br />UTILIZATION FACTOR 0.83 <br />OPERATOR EFFICIENCY 0.85 <br />ADJ. PRODUCTIVITY 609 LCY/SCH HR <br />SWELL FACTOR 17% <br />ADJ. PRODUCTIVITY 521 BCY/SCH HR <br />HIGHWALL DOZER PRODUCTION <br />EQUIPMENT REQUIRED <br />-CATERPILLAR D10N DOZER <br />DOZING PRODUCTION <br />DOZING DISTANCE 334 FT <br />GRADE -20 <br />BLADE TYPE SU <br />MATERIAL DENSITY 2250 LCY <br />PRODUCTION 511 LCY/SCH HR <br />GRADE FACTOR 1.42 <br />SLOT DOZING 1.2 <br />MATERIAL 1 <br />VISIBILITY 1 <br />ALTITUDE 0.96 <br />SPOIL FACTOR 0.8 <br />UTILIZATION FACTOR 0.83 <br />OPERATOR EFFICIENCY 0.85 <br />ADJ. PRODUCTIVITY 472 LCY/SCH HR <br />SWELL FACTOR 17% <br />ADJ. PRODUCTIVITY 403 BCY/SCH HR <br />B-2 <br />