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Additional info for 11th U.S./North American Mine Ventilation Symposium 2006 : proceedings of the 11th U.S./North American Mine Ventilation Symposium : the Pennsylvania State University, University Park, Pennsylvania, USA : 5-7 June 2006

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0035 4 TOTAL VENTILATION REQUIREMENT With the statistical information the total ventilation needed for the mine was defined as 160 m3 /s. 5 VENTILATION PROJECT • The ventilation projections for the new area of the mine were reviewed using the VNETPC 2000 software. 3 m2 . This has been a standard for the last years in mines 2,3,5 and 7. • Two new connections of the main returns to the vertical shaft were proposed also. • We used the average friction factor for MIMOSA’S entries supported with these arches; this has been obtained from ventilation surveys performed in all the mines using the gauge and tubing method also (see Table 1).

460 minutes per shift with simple timers. This increases their utilization from 22 to 39%, Table 3. Summary of observed activity start/finish times and derived “ideal” primary ventilation maximum duty operational schedule. 70 Maximum capacity operation programming Day shift Night shift Blast clearance Fans max Fans min Duration Fans max Fans min Duration Fans max Ideal Times (hh:mm) 8:15 # Shifts/ Blasts Required (hrs) Max. Total Max. e. machine operator initiated, and then run for 370 minutes (the maximum observed operating time plus clearance) or to the pre-programmed end of shift.

Typical plot of dry-bulb temperatures around a 250 kW scooptram mucking drawpoint. 77mins 29 17:45 18:15 18:45 19:15 19:45 20:15 20:45 21:15 21:45 22:15 22:45 23:15 23:45 0:15 0:45 1:15 Time (hh:mm) Face 1st Access Return 2nd Access Area Exhaust Figure 2. Expanded dry-bulb temperature showing cycle times and decay characteristics. 0 hrs End of Monitoring 09-Feb 3:30 5:30 7:30 9:30 11:30 13:30 15:30 17:30 19:30 21:30 23:30 1:30 3:30 Figure 3. Activity log derived from temperature monitoring at a mucking drawpoint operation.

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