Critical Resources (ASX:CRR) says its produced exceptional grade, low-impurity, coarse spodumene concentrate from its 100%-owned Mavis Lake lithium project in Ontario, Canada.

Critical Resources highlighted the first tranche of metallurgical testwork delivered excellent concentrate results up to 6.42% lithium.

The company says high lithium grades coupled with extremely low impurities demonstrates excellent potential for Mavis Lake to produce premium quality concentrate.

Critical Resources also says the results form the basis of Scoping Study work into Mavis Lake which is due for completion mid-CY2023.