LONDON--Tanzania's largest gold miner, African Barrick Gold (ABG.LN), Tuesday launched a full review of its operations following the failure of talks that could have seen China National Gold Group Corporation acquire a controlling stake in the company from Barrick Gold Corp (ABX).

The talks failed after the Chinese company and Barrick Gold could not agree a value for the 73.9% stake in ABG. At the current stock price of 354 pence a share, Barrick's stake in ABG is worth GBP1.34 billion ($2.16 billion). The news caused ABG's shares to fall more than 20% to a near six-month low.

At 1158 GMT shares in ABG were down 18.3%, or 81.4 pence, at 362.6 pence.

"[The] news will come as a disappointment to some who saw it as a potential exit from the under-performing [ABG] stock, with a price mooted around the 20p mark," said equity analyst Cailey Barker of Numis Securities in a note.

Barrick Gold said in a statement that despite the end of the talks, it remains committed to supporting ABG in fully realizing the potential of its business.

Someone who answered the telephone at the China National Gold Group Corporation declined to take questions or convey calls to the appropriate office.

ABG's shares have fallen 36% since they started trading in London in March 2010, following the company's spin-off from Barrick. ABG has since then been dogged by unrest at one of its mines, and other production setbacks. It is set to deliver a third-consecutive year of lower gold output in 2012, although its Chief Executive Greg Hawkins told Dow Jones Newswires that production should stabilize this year, and begin to rise again in 2014.

In October ABG revised down its 2012 gold output by 5% to 10% below its previous range of 675,000 troy ounces to 725,000 ounces, due in part to power outages. Mr. Hawkins said that he felt comfortable that the company would achieve that target after a step-up in gold production during the fourth quarter.

The company has decided to pay $67 million in dividends for 2012, on a par with 2011, in order to convince shareholders to stick with the company, he said.

African Barrick Gold has five operating gold mines, all located in northwest Tanzania, and several exploration projects at various stages of development.

Mr. Hawkins said the company has embarked on a full operational review of its business, with the aim of delivering more cash flow from its asset base by deploying capital more effectively and making sure it has an appropriate organizational structure. He said the company wasn't considering asset sales and was still open to acquiring assets.

Mr. Hawkins said that Barrick Gold has made it clear that it sees considerable long-term value in the ABG asset base.

(Carlos Tejada in Beijing contributed to this report.)

Write to Alex MacDonald at alex.macdonald@dowjones.com

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