Mount started every varsity game in four years at Lebanon High School, and scored in double figures each time. He averaged 27.3 points over 94 games, and finished with 2,595 points, which at the time was second on the state's all-time list of scorers. He scored 47 points in a semi-state tournament game against Logansport, 20 in the fourth quarter when he hit seven straight shots. His prep career-high was 57 against Crawfordsville. He was named Mr. Basketball in 1966, when he was one of the most coveted high school recruits in the country.
Mount, who appeared on the cover of Sports Illustrated magazine as a high school senior, continued his bombing mission at Purdue. He earned all-America honors all three of his varsity seasons, and led the Boilermakers to the championship game of the NCAA tournament as a junior. He went on to break former I.U. center Don Schlundt's Big Ten scoring record, and remains the conference's all-time leader in career scoring average (32.3)) and the single-game record-holder with 61 points against Iowa. Later research indicated Mount would have scored 74 points had the three-point line been in effect. He remains Purdue's all-time scoring leader with 2,323 points despite playing just 72 games over three varsity seasons.
Mount's professional career, which began with the Indiana Pacers, was cut short by a series of injuries and disenchantment with the fast-paced lifestyle. He also played with Kentucky, Utah and Memphis in the American Basketball Association before retiring at the age of 28.