**Preface to "Advances in Mineral Processing and Hydrometallurgy"**

A Special Issue of *Metals* was commissioned that was devoted to aspects of Mineral Processing and Hydrometallurgy. The editors were Prof. Dr. Corby Anderson and Dr. Hao Cui. This issue was designed to include submissions for characterization, along with recycling and waste minimization, 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 gold, silver, PGMs, aluminum, copper, zinc, lead, nickel, and titanium. Critical metal articles on topics such as lithium, antimony, tellurium, gallium, germanium, cobalt, graphite, indium, and the rare earth metals were welcome. Thirty-one high-quality peer-reviewed articles from around the globe were selected and accepted for inclusion, along with an Editorial Review overview article.

As such, this Special Issue of *Metals* was well supported by diverse submissions and a final publication of high-quality peer-reviewed articles. It is anticipated that, due to this success, a new Special Issue ("Advances in Mineral Processing and Hydrometallurgy II", website: https://www.mdpi.com/journal/metals/special\_issues/mineral\_process\_hydrometallurgy2) will be commissioned as a follow-up to accept global contributions from the hydrometallurgy and mineral processing community.

> **Corby G. Anderson, Hao Cui** *Editors*
