VALE Vale SA

RIO DE JANEIRO—Vale's chief executive on Thursday signaled that a rift was starting to emerge between the Brazilian mining giant and BHP Billiton Ltd., its partner in the Samarco joint venture that experienced a disastrous dam failure last year.

The disagreements center on waste disposal and debt at Samarco, Vale SA CEO Murilo Ferreira said in a conference call.

Samarco's operations have been halted since its Fundã o dam holding mine waste suddenly collapsed last November, killing 19 people and causing what is considered Brazil's worst-ever environmental catastrophe.

Vale believes that Samarco's previous method of disposing mine waste, called tailings, won't be viable in the future, Mr. Ferreira said.

"We don't think it would be viable to rebuild Fundã o," he said.

A BHP Billiton spokesman didn't immediately respond to an emailed request for comment.

Mr. Ferreira said he and BHP Billiton CEO Andrew Mackenzie plan to meet next week to discuss Samarco.

Vale could make some of its own infrastructure available to Samarco as the venture seeks to resume mining iron ore in Brazil's southeastern state of Minas Gerais, Mr. Ferreira said on the conference call. He didn't elaborate further.

"We think it would be necessary for Samarco to use Vale infrastructure," Mr. Ferreira said. "When you have a joint venture, you need to have a long-term alignment, and this is what we're looking to develop."

Mr. Ferreira said Vale and BHP have differing ideas as how to handle Samarco's debt.

Samarco said this week that it missed a debt payment for the second time since having its operations suspended in the wake of the Fundã o tragedy, prompting ratings firm Standard & Poor's to downgrade Samarco to D from CCC. The $20.1 million interest payment on Samarco's $700 million senior unsecured notes was scheduled for Oct. 24.

Samarco has said it "continues to explore options in relation to a restructuring of its debt."

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

(END) Dow Jones Newswires

October 27, 2016 11:15 ET (15:15 GMT)

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