  We report on the realization of a magneto-optical trap (MOT) for metastable
strontium operating on the 2.92 $\mu$m transition between the energy levels
$5s5p~^3\mathrm{P}_2$ and $5s4d~^3\mathrm{D}_3$. The strontium atoms are
initially captured in a MOT operating on the 461 nm transition between the
energy levels $5s^2~^1\mathrm{S}_0$ and $5s5p~^1\mathrm{P}_1$, prior to being
transferred into the metastable MOT and cooled to a final temperature of 6
$\mu$K. Challenges arising from aligning the mid-infrared and 461 nm light are
mitigated by employing the same pyramid reflector to realize both MOTs.
Finally, the 2.92 $\mu$m transition is used to realize a full cooling sequence
for an optical lattice clock, in which cold samples of $^{87}\mathrm{Sr}$ are
loaded into a magic-wavelength optical lattice and initialized in a
spin-polarized state to allow high-precision spectroscopy of the
$5s^2~^1\mathrm{S}_0$ to $5s5p~^3\mathrm{P}_0$ clock transition.
