  We compute the dimension-2 condensate, <A^2>, and the dimension-4 mixed
condensate, <\bar q A q>, from the recent quenched lattice results for the
quark propagator in the Landau gauge. We fit the lattice data to the Operator
Product Expansion in the "fiducial" region 1.2 GeV < Q < 3 GeV. Our result for
the dynamical gluon mass at the scale of 10 GeV^2 is m_A=600-650 MeV, in
agreement with independent determinations. For the mixed Landau gauge
condensate of dimension-4 we get alpha_s <\bar q g A q> = (-0.11 +/- 0.03)
GeV^4. This value is an order of magnitude larger than the <G^2> gluon
condensate.
