In exchange for turning over the 25 percent plus one share stake in Norilsk to Rusal, Prokhorov's Onexim group will receive 11 percent of shares in Rusal plus an undetermined amount of cash, Rusal and Onexim said in joint statement.
No value for the deal was given.
The surprise move was the latest in the ongoing shuffle surrounding Norilsk Nickel, the world's largest nickel miner.
Rusal became the world's biggest aluminum producer this year after a three-way merger between Rusal, its Russian rival Sual and the aluminum assets of Swiss-based commodities trader Glencore.
World's most powerful nuclear submarines, Arkhangelsk and Severstal, are to be dismantled after 2020 - their further exploitation is unprofitable
The United States' Head of Diplomacy, or Secretary of State, is an anachronistic, incompetent, meddling, intrusive, insolent and arrogant, rude individual, a brash, foul-mouthed upstart, a conceited, self-important guttersnipe and an insult to the international community, as fit for the job as a pedophile janitor in a grade school.