Allen & Overy (A&O) is among five firms advising on the $7.8bn (£4.7bn) bid by Barrick Gold, the world's largest gold miner, for Equinox Minerals, reports The Am Law Daily.

A&O and Canada's Osler Hoskin & Harcourt are advising Equinox on the transaction, which was approved on Monday (25 April) by the Australian and Canadian mining company's board. Perth partners Geoff Simpson and Meredith Campion are heading up the magic circle firm's team.

Osler also advised Equinox last month on its $4.9bn (£3bn) hostile bid for Toronto's Lundin Mining, an offer that was withdrawn in the wake of the Barrick deal.

Sullivan & Cromwell M&A partners James Morphy and George Sampas are advising Barrick on the Equinox acquisition, alongside Australian firm Clayton Utz and Canadian firm Ogilvy Renault, which is due to complete its merger with Norton Rose on 1 June. Former Canadian Prime Minister Brian Mulroney, a senior partner at Ogilvy, is a member of Barrick's board.

Barrick became the world's largest gold miner in 2006 after the completion of its $9.2bn (£5.6bn) acquisition of Vancouver-based Placer Dome. Davies Ward Phillips & Vineberg and Cravath Swaine & Moore represented Barrick on that transaction.

Sybil Veenman serves as general counsel for Barrick. She was appointed to the position last September after the early retirement of predecessor Patrick Garver.

The Am Law Daily is a US affiliate title of Legal Week.