The ION4RAW Project is dedicated to developing a cost-effective and environmentally friendly mineral processing technology to recover by-product metals from primary sources. The project proposes to use novel deep eutectic solvents (DES) to leach and jointly recover by-product metals alongside primary metals belonging to the Cu-Ag-Au deposits. Most of the targeted by-products elements are defined by the European commission as Critical Raw Materials, including Bismuth (Bi), Indium (In), and Antimony (Sb). The project is also working to ensure that it fits within a system capable of recovering major product metals, notably Copper (Cu), Silver (Ag) and Gold (Au). Other non-critical by-product metals may also be recovered, including Tellurium (Te).