  We study statistical characterization of the many-body states in the exactly
solvable model with internal degree of freedom in more than one dimension. The
model exhibits the Mott metal-insulator transition. It is shown that the ground
state is described by that of a generalized ideal gas of particles (called
exclusons) which have mutual exclusion statistics between different species. In
addition to giving a perspective view of spin-charge separation, the model
constitutes an explicit example of mutual exclusion statistics in more than two
dimensions.
