By Alistair MacDonald 

TORONTO--Two decades of intermittent merger talks between Barrick Gold Corp. and Newmont Mining Corp. were off again Monday amid public mudslinging about who killed a deal that would have created a global mining giant.

As the monthslong negotiations descended into recriminations on Monday, it became clear that the talks were scuttled by personality clashes and tussles over governance similar to those that former executives say sank earlier efforts to merge.

The two mining companies now face all of the problems--lower gold prices, high costs and declining accessible gold grades--that the combination aimed to alleviate. With operations in five continents and around 13% of global gold production, the companies expected the deal to produce $1 billion in cost reductions.

"Personalities, I don't care about that," said Caesar Bryan, a portfolio manager at the Gabelli Gold Fund that owns shares in both companies and believes they should still merge. "To the extent that there are synergies for the harvesting, let's do it."

The two sides agreed to terms, including economic and governance matters, on April 8, according to Barrick. But the agreement, Barrick said, unraveled over the next weeks as Newmont tried to renegotiate three "foundational elements": the location of the new company's head office in Toronto, the spinning off of some assets into a separate company and the issue of governance.

Newmont said a firm deal hadn't been reached and blamed Barrick's co-chairman John Thornton for making a "unilateral declaration" that the talks were over.

On the eve of the long Easter weekend, Mr. Thornton twice told Newmont that merger talks were "dead," according to a letter Newmont Chairman Vincent Calarco wrote to the Barrick board April 25 and which Newmont released to the public Monday morning. Mr. Thornton led Barrick's negotiations, according to people familiar with the matter.

"Efforts to find consensus have been rejected out of hand repeatedly," Mr. Calarco wrote.

Both miners have recently taken write-downs for deals made in headier times. Last year, gold miners wrote down $36 billion of value, according to BMO Capital Markets, and almost a third of that came from Barrick. Newmont has taken several billion dollars of write-downs, including $1.77 billion in the second quarter of last year.

Investors have punished their shares in equal measures, sending them both down around 64% from their highs when gold peaked nearly three years ago. Gold futures have fallen 30% from that peak.

The urgency failed to patch differences between the two sides, which included the roles of senior personnel, according to Newmont's letter and people familiar with the matter.

The two sides disputed the reporting line for Gary Goldberg, the Newmont chief executive who was to become CEO of the combined company, according to a person familiar with the matter. At one stage, Mr. Calarco, who was set to be lead director, wanted Mr. Goldberg to report to the new board rather than directly to Mr. Thornton and wished to make joint decisions on strategy with Mr. Thornton, according to that person.

Mr. Caralco declined to comment through a spokesman.

The two companies have talked about a deal off and on for almost two decades, and could resume the discussions.

Some investors had hoped that a changing of the guard at Barrick with the departure of founder Peter Munk this week would help smooth a merger.

Mr. Munk, a larger-than-life character in Canadian business circles known for his deal-making penchant, alienated Newmont during the talks by giving interviews and at one point calling Newmont "not shareholder-friendly," a point raised by Mr. Calarco in his letter.

But the collapse in talks, and Mr. Calarco's comments about Mr. Thornton's role, is likely to stoke shareholder frustration with Mr. Thornton and Barrick, a company that has been repeatedly criticized on the issue of corporate governance and boardroom pay.

On Monday, Canada's giant pension fund, the Canada Pension Plan Investment Board, said it plans to oppose Mr. Thornton's $9.5 million compensation for 2013, which was reduced from the $17 million he was paid a year earlier.

"We continue to be concerned with the company's practice of granting outsized awards on a largely discretionary basis, which we believe is inconsistent with the governance principle of pay-for-performance," the pension fund said.

Now, both Newmont's Mr. Goldberg and Barrick CEO Jamie Sokalsky, who, in the merger scenario, was to have headed the spun-off company, will be under pressure to continue to cut costs while steering clear of the sort of big-vision deal they attempted to seal.

They likely can't count on help from higher gold prices.

While gold is up year-to-date, most gold watchers expect the metal to end the year flat to lower as Chinese demand falters and as the U.S. Federal Reserve winds down its efforts to stimulate the economy. That stimulus had supported gold, which is used by investors as a hedge against the inflation that such efforts can spark.

Ben Dummett and John W. Miller contributed to this article.

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

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