An unknown buyer acquired 31.4% stake in Prime Minerals S.A. (WSE:PMT) from Black River DWC-LLC on December 1, 2018. Post completion, Black River DWC-LLC will hold no stake in Prime Minerals S.A. An unknown buyer completed the acquisition of 31.4% stake in Prime Minerals S.A. (WSE:PMT) from Black River DWC-LLC on December 1, 2018.