  We use determinant Quantum Monte Carlo simulations and exact diagonalization
to explore insulating behavior in the Hubbard model with a bimodal distribution
of randomly positioned local site energies. From the temperature dependence of
the compressibility and conductivity, we show that gapped, incompressible Mott
insulating phases exist away from half filling when the variance of the local
site energies is sufficiently large. The compressible regions around this Mott
phase are metallic only if the density of sites with the corresponding energy
exceeds the percolation threshold, but are Anderson insulators otherwise.
