By Alistair MacDonald 

Canadian gold companies Yamana Gold Inc. and Agnico-Eagle Mines Ltd. Wednesday agreed to buy Osisko Mining Corp. for 3.9 billion Canadian dollars ($3.6 billion), the latest twist in a takeover saga that should produce one of the largest deals so far this year in a sector that has seen a steep decline in acquisitions.

This third bid for the Quebec-based company underscores how mining companies are paying a premium for assets in politically safe jurisdictions. But despite this deal, and Glencore Xstrata PLC's $5.8 billion sale of a mine in Peru over the weekend, bankers say mining companies remain cautious on takeovers after being punished for past deals.

Wednesday's joint offer will see Osisko shareholders get about C$1 billion in cash, C$2.3 billion in Yamana and Agnico-Eagle shares, and a stake in a spinoff company, New Osisko, that the bidders value at about C$575 million, the companies said.

The offer represented an 11% premium to a rival, hostile bid for Osisko from mining giant Goldcorp Inc., based on share prices at Tuesday's close, they said. Following the completion of the transaction, Osisko shareholders would own about 14% of Yamana and about 17% of Agnico-Eagle, both of whose shares fell steeply in morning trade.

The deal would give Yamana and Agnico-Eagle control of Osisko's flagship Canadian Malartic gold mine in northern Quebec. The mine has been coveted by Goldcorp and other mining companies not least for its sheer size and the high grade of its gold deposits, but because it is located in a developed country. Many mining companies have struggled in emerging countries where tax rates have been increased and environmental demands stepped up.

"These assets do not come along that often," Agnico-Eagle Chief Executive Sean Boyd said on a conference call. "Our political risks is among the lowest in the country, we feel that is important."

Mr. Boyd and Yamana Chief Executive Peter Marrone said they were also eager to get their hands on Osisko's exploration properties in the Kirkland Lake mining camp in Ontario. A Mexico-based project will be spun out into so-called New Osisko, a unit that will also hold a small portfolio of other assets and liabilities.

The deal addresses analysts' criticisms that a previous offer by Yamana could prove too complicated for investors. On April 2, Yamana had agreed to take a 50% stake in the mining assets of Osisko, which said it would also sell the rights to a stream of gold from Canadian Malartic as one part of a wider C$550 million financing from two big Canadian pension funds.

"The complexity of this new offer is far less than that of the previously announced Yamana partnership, and we believe this new bid will be well regarded by shareholders," Michael Parkin, an analyst at Desjardins Securities, said in a research note.

Analysts had believed nobody would bid against Goldcorp, which has chased Malartic for five years, when it made its first offer in what has become at times an acrimonious process.

"When the bid came in from the 800 pound gorilla in January we figured this was a banana that was going to be lost for sure," Don MacLean, an analyst at Paradigm Capital, said on a conference call.

A spokeswoman for Goldcorp, whose cash and stock offer is currently valued at about C$3.6 billion, wasn't immediately available to comment. Wednesday's deal contains a C$195 million breakup fee, large by industry standards.

The $60 billion in mining deals completed last year was the lowest tally since 2005 and less than half the value of deals completed the year before, according to Dealogic.

Ben Dummett contributed to this article.

Write to Alistair MacDonald at alistair.macdonald@wsj.com

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