Anglo-Australian mining group Rio Tinto has said its bid to buy Canada's Alcan for $38.1bn (£19bn) has been approved by US antitrust authorities.
The mining sector has seen consolidation
Under the terms of the deal, Rio Tinto, which is listed on both the London and Australian stock exchanges, is to pay $101 for each Alcan share.
Alcan had rejected a $27bn hostile takeover bid from US miner Alcoa on the grounds that it undervalued the firm.
The deal is to make Rio Tinto the largest maker of aluminium and bauxite.
Analysts had not been expecting any serious antitrust barriers to the deal.
Record metal prices have prompted consolidation in the industry.
Rio Tinto shares were trading some 3% higher in Australia.