Aurubis AG and Codelco have been working together to develop a hydrometallurgical process to treat lower arsenicArsenic-bearing copperCopper-concentratesConcentrate: 0.5–2.5 wt.% As. This process aims to produce a “clean” concentrateConcentrate with arsenicArsenic concentrations below 0.1 wt.% while disposing the arsenicArsenic as scoroditeScorodite. This process primarily consists of leachingLeaching, crystallizationCrystallization, and oxidation stages to selectively remove arsenicArsenic from concentratesConcentrate and produce a calcium arsenate intermediate in the “Aurubis Process” which is amenable to further low-cost conversion to scoroditeScorodite in the process being operated by EcometalesEcoMetales (a subsidiary of Codelco) for over ten years now, the “EcoMetalesEcoMetales ScoroditeScorodite Process”. ScoroditeScorodite is a stable compound with very low arsenicArsenic solubilitySolubility and therefore preferred to dispose arsenicArsenic safely and has been classified by the Chilean government as non-hazardous waste. Laboratory test work underpinning the leachingLeaching, crystallizationCrystallization and oxidation processes has been performed by Aurubis’ R&D Department in Hamburg while the Arsenic fixationArsenic fixation tests were performed by EcometalesEcoMetales laboratories in Calama, ChileChile. The process developed maximizes arsenicArsenic leach efficiencyEfficiency, using alkaline sulfideSulfide leach chemistry while optimizing reagent consumption and reuse. Copper concentrate Concentratefrom Chuquicamata (Chuqui), a major Codelco mineMine, containing 1.4% Arsenic, have been leached during the testworkTestwork trails, yielding arsenicArsenic leach efficienciesEfficiency over 98% with ArsenicArsenic as low as 0.05 wt.% in the final “cleaned “concentrateConcentrate Arsenic. A sample of the arsenicArsenic intermediate produced during the teswork has been shipped to EcoMetalesEcoMetales for further leachingLeaching and subsequent fixation as scoroditeScorodite. The intermediate leach and scoroditeScorodite residues have been environmentally evaluated, with both passing TCLP non-hazardous classification for arsenicArsenic. This paper will discuss the evolution of the Aurubis process by presenting the results from several test work stages, showing yields and product purities obtained. The results of the scoroditeScorodite testworkTestwork fixation performed by EcoMetalesEcoMetales will also be discussed, including TCLP results, and arsenicArsenic characterization. ArsenicArsenic rich copper concentrateCopper concentrate deposits are available around the world. Unlocking this copperCopper source will require a process that can recover the copperCopper while ensuring the arsenicArsenic is deposited in a safe and environmentally sustainable way, preferably at the mineMine site.