Dejean-Jones contributed 12 points and Marshall added 11 as the Runnin' Rebels (9-1) recorded a seventh consecutive victory.
Also contributing in the win were Anthony Bennett and Katin Reinhardt, each of whom put in 10 points.
Miners (3-5) were paced by Julian Washburn with 13 points and eight rebounds.
Also reaching double figures for UTEP was Konner Tucker with 12 points in his first game of the season.
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