During the past 10 years, there have been incremental advances in the application of solvent ex-traction to process hydrometallurgy. The most cited areas in the literature include chemistry, chemical engi-neering, pilot plants, and plant operation. Within these areas, there were considerable interest in synergism, diluents, degradation, contactors, surfactants, hydrometallurgical applications, environmental and secondary applications, and health and safety. The summary to the present is followed by a prediction for the future in the above areas of interest. These include the use of speciation; improved understanding of the role of sur-factants on the system; optimization through modelling, pilot plants, and contactor selection; improvements in plant operation; further new applications; and plant safety. The review has indicated that considerable knowledge is now available to optimize and improve on process design and plant applications. During the past 10 years, there have been incremental advances in the application of solvent ex-traction to process hydrometallurgy. The most cited areas in the literature include chemistry, chemical engi-neering, pilot plants, and plant operation. Within these areas, there The summary to the present is followed by a prediction for the future in the above parts of interest. These include the use of speciation; improved understanding of the role of sur-factants on the system; optimization through modeling, pilot plants, and contactor selection; improvements in plant operation; further new applications; and plant safety. available to optimize and improve on process design and plant applications.