By Paul Kiernan 

RIO DE JANEIRO--Brazilian mining giant Vale SA said Friday it may consider an out-of-court settlement to a massive lawsuit in which it has been accused of "stealing" a West African mine from rival Rio Tinto PLC.

The lawsuit alleges that Vale and a former partner, Israeli billionaire Beny Steinmetz, worked together to "misappropriate" Rio Tinto's rights to the Simandou iron-ore deposit through corruption. In it, plaintiff Rio Tinto says Mr. Steinmetz's company, BSG Resources, bribed officials in the Guinean government to revoke half of its Simandou concession and then partnered with Vale, which "knew or should have known" about the payments. Mr. Steinmetz and BSG Resources are also named as defendants in the suit.

The lawsuit pits two of the world's biggest mining companies against each other in an uncommonly public battle and involves one of the mining industry's most tantalizing prizes: a large and virtually untapped lode of high-quality iron ore. Rio Tinto says it lost billions of dollars in assets and investments made before its Simandou rights were revoked, and claims it is entitled to "treble" damages.

Clovis Torres, Vale's general counsel, said Friday his company might be willing to settle the lawsuit, but "never as an acceptance of guilt."

"What may be even more absurd than this lawsuit is the high cost of legal processes in the U.S.," Mr. Torres said in an event broadcast from London. "So to avoid the additional absurdity of incurring even more costs, we could without a doubt think of something along those lines."

Representatives for Mr. Steinmetz didn't immediately respond to a request for comment.

A potential settlement isn't "on the table" yet, since Vale is currently awaiting a U.S. judge's decision on where the case should be tried. Rio Tinto filed the lawsuit in New York, while Vale argues the dispute should go to arbitration in London.

"They need to rule on that point before continuing ahead to the discovery process," Mr. Torres said.

The lawsuit was filed in April, weeks after a Guinean government investigation concluded that Mr. Steinmetz's BSG Resources had obtained rights to Simandou by improper means. As a consequence of the investigation, Guinea revoked the concession from BSG Resources and Vale.

BSG Resources has denied wrongdoing and filed an arbitration request in a bid to win compensation from Guinea for stripping it of its rights. Mr. Steinmetz has previously called the Guinean probe's findings a smear campaign against him.

Rio Tinto declined to comment on Friday. In the lawsuit, it said BSG Resources paid a $200 million bribe to Guinea's former minister of mines in 2010, shortly after receiving a $500 million upfront payment from Vale in exchange for a 51% stake in its Simandou joint-venture with BSG Resources.

The former minister of mines, Mahmoud Thiam, is also a defendant in the lawsuit. He said Rio Tinto has been "spreading lies" about him for years and that he is "very, very happy" to continue battling the company in court to set the record straight.

"I'm not in a settling mood," Mr. Thiam said. "I'll exact my pound of flesh before this process ends."

Vale had previously been in talks with Rio Tinto to buy some of the Simandou assets, gaining confidential information about how to develop the mine in the process, the lawsuit alleges. This "double dealing" ultimately allowed the Brazilian firm to acquire an interest "on the cheap" from BSG Resources, which had no prior experience in iron-ore mining, according to the lawsuit.

In April, Vale said it condemned the use of "corrupt practices" and noted that the Guinean government probe found no involvement in "fraudulent conduct" on its part.

Write to Paul Kiernan at paul.kiernan@wsj.com

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