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By Jan M Mutmansky; R V Ramani

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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.

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). 2 Development For the development methane generation prediction, a statistic of a development system of a five-month period of other sections in MIMOSA with similar conditions and methane drainage system was used.

A decision to continue mining in the Orivesi mine was released on July 2005. Mining of the Sarvisuo Lode is planned to start in spring 2006. 1 Location and geology As a part of the mine planning for Sarvisuo orebodies the requirements for ventilation during stoping and alternative implementation possibilities for ventilation were studied from autumn 2004 to early 2005 to give a basis for feasibility calculations. Base material was obtained from Sarvisuo mining plans, maps, and coordinates obtained from the Orivesi mine as well as estimates on the usability of existing infrastructure.

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