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When the raise bore bit is lifted to within 5 feet of the hole <br />completion; the miners wa~l~l,~ withdrawn from the mine and the <br />power removed in the" uZTtil the hole is completed, At <br />this time the. mine ventilation will be examined in its <br />entirety and the. necessary changes will be made before <br />returning to work. All it from h pilot hole wihl~~be v~ <br />to the eturn. ~dl. r""I"`~" <br />uu in ~ ~ning of the shaft, the ventilation will be <br />directed and regulated to the return to ensure a minimum <br />quantity of 3000 CFM in the shaft. <br />A sufficient quantity of air will be maintained in the <br />"bleeder entries" to ensure the methane concentration is less <br />than 10. <br />Drawing attached (Excavation Ventilation) <br />Shaft Completion: <br />Following *_he completion cf the shaft, an exhaust fan will be <br />installed on the shaft. The fan will be installed a;.d <br />operated in accordance with the requirements of 75.300 <br />Mechanical Ventilation - Main Fan. When the fan becomes <br />operational the air courses will be examined for "dead" areas <br />and corrective action taken to eliminate them. <br />In the event the longwall becomes operational before the shaft <br />is completed, the shaft will be intaking and the air flow for <br />the longwall will be directed thru the bleeder entries. <br />Drawing attached (Completed Ventilation with and without fan). <br />The following lists the specifications for the exhaust fan. <br />Mfg. Jeffrey <br />Model 12A83 <br />Type. Axial Vane <br />Speed 880 RPM (minimum) <br />Horsepower 400 hp (minimum) <br />Voltage 4160 v (Independent power circuit) <br />Automatic self closing doors <br />Automatic signaling device <br />Explosion doors <br />Fan charts for the anticipated fan speeds for the life of <br />the installation are attached. <br />The existing TLT Babcock exhaust fan located in Cirulea Canyon <br />will be fitted with automatic self closing doors prior to <br />- y commi ssioring the iQW-1 e.{haust fan. <br />t~PPROUED C1~S ~ N ~~ ~~ ~,~ "~ ~~ <br />hTTd-1 w..rn_nc. C}.~Ft <br />