  Intervening metal absorption lines in the spectra of z > 6 quasars are
fundamental probes of the ionization state and chemical composition of
circumgalactic and intergalactic gas near the end of the reionization epoch.
Large absorber samples are required to robustly measure typical absorber
properties and to refine models of the synthesis, transport, and ionization of
metals in the early Universe. The "Ultimate XSHOOTER legacy survey of quasars
at z~5.8-6.6" (XQR-30) has obtained high signal-to-noise spectra of 30 luminous
quasars, nearly quadrupling the existing sample of 12 high quality z~6 quasar
spectra. We use this unprecedented sample to construct a catalog of 778 systems
showing absorption in one or more of MgII (360 systems), FeII (184), CII (46),
CIV (479), SiIV (127), and NV (13) which span 2 < z < 6.5. This catalog
significantly expands on existing samples of z > 5 absorbers, especially for
CIV and SiIV which are important probes of the ionizing photon background at
high redshift. The sample is 50% (90%) complete for rest-frame equivalent
widths W > 0.03AA (0.09AA). We publicly release the absorber catalog along with
completeness statistics and a Python script to compute the absorption search
path for different ions and redshift ranges. This dataset is a key legacy
resource for studies of enriched gas from the era of galaxy assembly to cosmic
noon, and paves the way for even higher redshift studies with the James Webb
Space Telescope and 30m-class telescopes.
