  The metal content of asteroids is of great interest, not only for theories of
their origins and the evolution of the solar system but, in the case of
near-Earth objects (NEOs), also for impact mitigation planning and endeavors in
the field of planetary resources. However, since the reflection spectra of
metallic asteroids are largely featureless, it is difficult to identify them
and relatively few are known. We show how data from the Wide-field Infrared
Survey Explorer (WISE)/NEOWISE thermal-infrared survey and similar surveys,
fitted with a simple thermal model, can reveal objects likely to be metal rich.
We provide a list of candidate metal-rich NEOs. Our results imply that future
infrared surveys with the appropriate instrumentation could discover many more
metal-rich asteroids, providing valuable data for assessment of the impact
hazard and the potential of NEOs as reservoirs of vital materials for future
interplanetary space activities and, eventually perhaps, for use on Earth.
