Potentiostatic anodic and cathodic polarization curves have been obtained for numerous sulfide and oxide minerals in 1N sulfuric and hydrochloric acids at ambient temperature and 90 degrees C. Polarization curves are compared in this paper for various minerals to show the effects of acid composition and temperature on predicted leaching rates. Predictions generally agree with published experience for both oxidizing and reducing conditions. Polarization curves combined for various mineral pairs show practical effects of galvanic interactions as a function of acid type, temperature, and relative surface area. Applications and limitations of the method are discussed.