This study shows the behavior of di-sodium carboxymethyl trithiocarbonate (Orfom® D8) depressant, an organic depressant used in the depression of copper in the differential separation of chalcopyrite-molybdenite during flotation to produce two saleable products. Fundamental electrochemical findings on possible adsorption modes by which the Orfom® D8 depressant adsorbs onto the target mineral surface are reported. Results show the use of Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS) and Chronoamperometry as useful techniques in the evaluation of mechanistic interaction of Orfom® D8 depressant. The study compares how Orfom® D8 depressant adsorbs onto copper and chalcopyrite surfaces. The experimental responses were fitted to an equivalent circuit using data obtained from Nyquist and Bode plots to model the system. Information on the kinetic mechanisms (oxidation and reduction) were obtained by analyzing the capacitive responses on the phase spectra. The mechanism of adsorption of the Orfom® D8 on the substrate surfaces support a controlling mechanism via diffusion or charge transfer at either high or low potential. Results corroborate UV-Vis, Zeta-Potential, FT-IR and XPS measurements reported elsewhere.