Black River DWC-LLC acquired an additional 8.33% stake in Prime Minerals S.A. (WSE: PMT) on April 6, 2017. Post-acquisition Black River DWC-LLC holds 14.56% stake in Prime Minerals S.A. Black River DWC-LLC completed the acquisition of an additional 8.33% stake in Prime Minerals S.A. (WSE: PMT) on April 6, 2017.