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We present findings of the detection of Magnesium II (Mg II, {\lambda} =2796, 2803 {\AA}) absorbers from the early data release of the Dark EnergySpectroscopic Instrument (DESI). DESI is projected to obtain spectroscopy ofapproximately 3 million quasars (QSOs), of which over 99% are anticipated to beat redshifts greater than z > 0.3, such that DESI would be able to observe anassociated or intervening Mg II absorber illuminated by the background QSO. Wehave developed an autonomous supplementary spectral pipeline that detects thesesystems through an initial line-fitting process and then confirms the lineproperties using a Markov Chain Monte Carlo sampler. Based upon a visualinspection of the resulting systems, we estimate that this sample has a puritygreater than 99%. We have also investigated the completeness of our sample inregard to both the signal-to-noise properties of the input spectra and therest-frame equivalent width (W0) of the absorber systems. From a parent catalogcontaining 83,207 quasars, we detect a total of 23,921 Mg II absorption systemsfollowing a series of quality cuts. Extrapolating from this occurrence rate of28.8% implies a catalog at the completion of the five-year DESI survey thatwill contain over eight hundred thousand Mg II absorbers. The cataloging ofthese systems will enable significant further research because they carryinformation regarding circumgalactic medium environments, the distribution ofintervening galaxies, and the growth of metallicity across the redshift range0.3 < z < 2.5.

Detecting and Characterizing Mg II absorption in DESI Survey Validation Quasar Spectra