By Jan M Mutmansky; R V Ramani
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Additional resources 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
4 m increased the amount of fresh air, but unfortunately due to the fan restrictions about 5 m3 /s only, and thus even this did not solve the problem. If about 50 m3 /s to 60 m3 /s will be a satisfactory fresh air amount, the solution is usable in the large project, when the connecting tunnel between Sarvisuo and the old mine at the level +530 m will be used as an airway only, and when a booster fan will be installed there. In this case almost all fresh air coming to the level +550 m from ivn1 can be transported into Sarvisuo.
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).
Small project with two shafts at Sarvisuo. 5 Sarvisuo Lode area was in both projects, large and small, about 51 m3 /s. 3. Alternative 3 was actually alternative 2 with 3 m diameter shafts for both the large and the small project. Both air velocities in the shafts and the drift costs of the shafts decreased clearly, especially when the modelled air volumes were large. Otherwise this alternative worked similarly to the previous alternative. 4. An alternative where in the large project a 3 m diameter inlet raise for fresh air is driven at Sarvisuo to conduct all fresh air into the mine, together with a 2,4 m exhaust raise, was studied, too.
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 by Jan M Mutmansky; R V Ramani