A cosmic ray magnetic particle spectrometer utilizing wire spark chambers and a superconducting magnet for momentum determination and scintillators for charge and velocity determination has been operated on top of Mt. Lemmon near Tucson, Arizona at an atmospheric depth of 747 g/cm². Twenty weeks of data were taken and the proton energy spectrum in the momentum range of 0.6 to 2.4 GeV/c has been determined. Antiproton events were observed and a p/p ratio of 1.5(+1.85,-0.95) x 10⁻³ at a momentum of 1.05 GeV/c was measured. Deuteron intensities and alpha particle upper limits for this energy region are also presented.