  The appearance of colossal magneto resistance (CM) in Tl$_{2}$Mn$_{2}$O$_{7}$
has stimulated many recent studies of the pyrochlore family of compounds
A$_{2}$B$_{2}$O$_{7}$. The double exchange (DE) model of Zener does not
describe the CM in Tl$_{2}$Mn$_{2}$O$_{7}$, because its metallic conductivity
cannot be explained by doping. Here we employ Hubbard operators to reformulate
the intermediate valence model used by Ventura and Alascio to describe the
electronic structure and transport properties of this compound $(Phys.Rev. B56,
14533 (1997)). Following Foglio and Figueira (Phys.Rev. B62, 7882 (2000)) we
use approximate one-electron Green's Functions (GF) to calculate the
thermopower and the static and dynamic conductivity of Tl$_{2}$Mn$_{2}$O$_{7}$
for several magnetic fields. A qualitative agreement was obtained with the
experimental measurements of those properties. Although the agreement is far
from perfect, these quantities are fairly well described by the same set of
system parameters.
