  We study the effects of intersite RKKY-like interactions in the mixed valence
regime of a two-band extended Hubbard model. This model is known to display a
metallic non-Fermi liquid state with spin-charge separation in the standard
$D=\infty$ limit (where interactions lead to purely on-site fluctuations only).
Using an extended $D=\infty$ approach, we find that the spin-charge separation
survives the quantum fluctuations associated with arbitrary intersite
density-density interactions and a finite range of intersite spin-exchange
interactions. We determine the qualitative behavior of the spin, charge, and
single-particle correlation functions. The implications of these results for
the solution in finite spatial dimensions are discussed.
