HIGHLIGHTS • Successful locked-cycle test ("LCT") results further support the Cinovec project's credentials to initially produce battery-grade lithium carbonate. • European Metals has demonstrated that Cinovec battery grade lithium carbonate can be easily converted into lithium hydroxide monohydrate with a commonly utilised liming plant process. • Six LCTs were planned but testwork was stopped after four cycles as the main process stream compositions had successfully stabilised. • Battery grade lithium carbonate was produced in every LCT with lithium recoveries of up to 92.0% achieved in the four LCTs performed. • The LCTs tested zinnwaldite concentrate from the southern part of Cinovec, representative of the first five years of mining.