  We present X-ray diffraction (XRD), M\"ossbauer spectroscopy (MS) and d.c.
magnetization measurements performed on ball-milled CuFe2O4 samples. The
average particle size <d> was found to decrease to the nanometer range after
t=15 min of milling. Room temperature M\"ossbauer data showed that the fraction
of particles above the blocking temperature TB increases with milling time, and
almost complete superparamagnetic samples are obtained for <d> = 7(2) nm.
Magnetization measurements below TB suggest spin canting in milled samples. The
values of saturation moment mu_S reveal that site populations are slightly
affected by milling. M\"ossbauer resonant intensities are accounted for on the
basis of local disorder of Fe3+ environments, and the development of sample
inhomogeneities of CuxFe3-xO4 composition.
