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Abstract:
The CUPP project (Centre for Underground Physics in Pyhäsalmi)
aims at establishing underground physics experiments in the Pyhäsalmi
zinc/copper mine. The mine is presently 1220 metres deep and mining will go
on until at least year 2012. The first proposed large underground
experiment is a multimuon experiment at only 50 metres consisting of seven
100m$2$ detector elements arranged in a hexagonal array with one in the
centre. The detector is especially designed for the composition study of
the knee region $10^{15}-10^{16}$eV. The model dependence of the Monte
Carlo simulations is discussed.