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All measurements were done in the caverns of Pyhäsalmi mine. The average
rock density in the mine is measured to be 2.8 g/cm3. This value
was used to estimate the depths in m.w.e units. Minimum depths for the 400
meter level measurement places were obtained from the theoretical analysis of
the mine [T. Kulju, J.T. Peltoniemi, J. Sarkamo, 2004].
Measurement places were on surface, 400 m (two places), 660 m, 990 m and
1390 m levels.
Locations in xz-plane of the measurement places are shown in the following
figure. Rooms at 400 m level are under the old open pit, which is partly
filled. Hence the rock abundance is lower than the level indicates. The
caverns at deeper levels are not directly under the open pit, which makes its
effect smaller.
Last modified 9-March-2005 by Annika Mattila,
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