<p>This is a Special Issue of <em>Metals</em> devoted to aspects of Advances in Mineral Processing and Hydrometallurgy. This includes a global call for article submissions that also included Characterization along with Recycling and Waste Minimization. As such both primary and recycled aspects will be considered. Possible specific topics included Mineralogy Geometallurgy Thermodynamics Kinetics Comminution Classification Physical Separations Liquid-Solid Separations Leaching Solvent Extraction Ion Exchange Activated Carbon Precipitation Reduction Process Economics and Process Control. Suggested application areas were in Gold Silver PGM's Aluminum Copper Zinc Lead Nickel and Titanium. Critical Metals articles on topics such as Lithium Antimony Tellurium Gallium Germanium Cobalt Graphite Indium and Rare Earth were also welcome. As such this Special Issue of <em>Metals</em> was well supported by diverse submissions and the final publication of high-quality peer-reviewed articles.</p>