April 16 (Reuters) - Polymetal International Plc:
* Polymetal says it has completed an acquisition of a 45 percent stake in the Prognoz silver deposit.
* The metals miner says it expects a potential investment decision in H1 2021 and for full production run-rate to be achieved in 2024.
* Polymetal says it has agreed to exchange its Tarutin project for an 85 percent stake in east Tarutin deposit in Kazakhstan. Source text for Eikon: Further company coverage: (Reporting by Moscow newsroom)