By Paul Kiernan 

RIO DE JANEIRO--Brazilian mining giant Vale SA is considering an initial public offering of a minority stake in its base metals division, as it hopes to "unlock" value amid an uncertain outlook for iron ore, Chief Executive Murilo Ferreira said Tuesday.

Company executives have said in recent quarters they expect a drastic improvement in the division's earnings following higher prices and recently finished projects to increase nickel and copper output.

Earnings before interest, taxes, depreciation and amortization, or Ebitda, in the segment stood at $1.94 billion in the first three quarters of this year, compared with $1.64 billion in all of 2013.

Jennifer Maki, executive director of Vale's base metals division, said in a presentation to investors Tuesday that Ebitda in 2015 is expected to reach between $4 billion and $6 billion. Better prices for nickel and ramp-ups of Vale's nickel and copper operations are seen driving profitability next year.

Mr. Ferreira, however, said the share sale isn't certain.

"I am not considering to sell a minority stake through an IPO at any price, just in case of having a fair price," Mr. Ferreira said.

Vale also said it plans to reduce investment in 2015 for a fourth consecutive year amid slumping prices for iron ore and other commodities.

Vale, the world's biggest iron-ore producer, said it plans to invest $10.17 billion next year on projects and sustaining operations. That is down from an initial forecast of $14.8 billion of capital spending in 2014, a figure that executives recently said would be cut by $1 billion to $2 billion.

Investors had expected investments of around $10.5 billion, according to the average estimate in a survey of analysts by the local Agencia Estado newswire.

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

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