The Pristine Survey -- VI. The first three years of medium-resolution
  follow-up spectroscopy of Pristine EMP star candidates
  We present the results of a 3-year long, medium-resolution spectroscopic
campaign aimed at identifying very metal-poor stars from candidates selected
with the CaHK, metallicity-sensitive Pristine survey. The catalogue consists of
a total of 1007 stars, and includes 146 rediscoveries of metal-poor stars
already presented in previous surveys, 707 new very metal-poor stars with
[Fe/H] < -2.0, and 95 new extremely metal-poor stars with [Fe/H] < -3.0. We
provide a spectroscopic [Fe/H] for every star in the catalogue, and [C/Fe]
measurements for a subset of the stars (10% with [Fe/H] < -3 and 24% with -3 <
[Fe/H] < -2) for which a carbon determination is possible, contingent mainly on
the carbon abundance, effective temperature and S/N of the stellar spectra. We
find an average carbon enhancement fraction ([C/Fe] >= +0.7) of 41 +- 4% for
stars with -3 < [Fe/H] < -2 and 58 +- 14% for stars with [Fe/H] < -3, and
report updated success rates for the Pristine survey of 56 % and 23 % to
recover stars with [Fe/H] < -2.5 and [Fe/H] < -3, respectively. Finally, we
discuss the current status of the survey and its preparation for providing
targets to upcoming multi-object spectroscopic surveys such as WEAVE.
