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of the shaft or at the drill steel at the top of the shaft, <br />drilling will be halted immediately, and additional air will <br />be supplied to dilute the methane. The mine foreman will be <br />notified of this level of methane or higher immediately. If at <br />any time, 1.08 methane is reached, drilling will be halted and <br />power removed from the affected area. If at any time, 1.58 <br />methane is detected, drilling will be halted, power removed <br />from the mine, and the mine evacuated because of the location <br />of the shaft. <br />When the raise bore bit (5-foot diameter) is lifted to within <br />5-feet of the hole completion, the mine will be idled, the <br />miners withdrawn and the power removed until the hole is <br />completed. At this time, the mine will be examined to assure <br />that the ventilation has not been affected. <br />In the unlikely event that blasting results in the muck <br />plugging the raise borehole after the blast, a small mine fan <br />will be available to provide ventilation to the muck Wile to <br />clear the gases and provide ventilation while the hole is <br />lanced open. <br />Shaft Lining: <br />During the lining phase of the construction, the air flow will <br />be controlled at the shaft bottom so mine operations are not <br />affected. <br />77.1900 SHAFT CONSTRUCTION PLAN <br />77.1900 (A)(1) Mine <br />Foidel Creek Mine <br />Oak Creek, Routt County, Colorado <br />MSHA I.D. # 05-03836 <br />77.1900 (A)(2) Operator <br />... <br />Twentymile Coal Company <br />29515 Routt County Road #27 <br />Oak Creek, Colorado 80967 <br />(303) 879-3800 <br />APPROVED CMS & H PA A R 2 x'95 <br />l 4 <br />