(Recasts first sentence with copper mining and nickel production, adds comments by CEO and CFO, debt goal, other financial details)
By Alexandra Alper and Marta Nogueira
RIO DE JANEIRO, July 27 (Reuters) - Brazilian miner Vale SA said on Thursday it would seek out fresh copper mining options and stop expanding nickel production capacity after second-quarter net income plunged on forex losses, rising costs and weaker iron ore prices.
Net income tumbled 99 percent to $16 million from $1.1 billion a year earlier, far below an average estimate of $421 million.
The world's largest iron ore miner kept making slow progress on cutting net debt, which slipped 3 percent in the three months through June to $22.12 billion - still a far cry from a target of $15 billion to $17 billion by year-end.
Fabio Schvartsman, who took over as CEO in May, said the company was aiming for $15 billion in net debt in 2018, adding that a company reliant on volatile commodity prices should ideally not be carrying debt at all.
"I personally don't have $15 billion as a target for the company's debt. Vale's debt has to be as low as possible. Certainly below 15 is our goal," he said on a conference call.
Schvartsman also said Vale would cease to invest fresh funds in its Caledonia nickel mine, in a bid to reduce costs.
However, Vale also narrowed its iron ore output forecast for the year to 360 million to 365 million tonnes, after stating last week that production would close 2017 near the bottom of its forecast of 360 million to 380 million tonnes.
Preferred shares of Vale closed down about 0.5 percent at 27.81 reais in volatile trading on Thursday.
Chief Financial Officer Luciano Siani Pires told analysts that production costs for iron ore in local terms should fall back to around 46 reais ($14.60) per tonne. He forecast coal costs falling below $60 per tonne, down from $74 in the quarter.
Siani Pires also pledged to keep cutting capital spending, which fell 31 percent to $894 million in the second quarter, the lowest level since 2006. That helped lift free cash flow to $2.15 billion, from $761 million reported a year ago.
The company said it would also seek to deliver iron ore to China at under $30 per tonne.
Still, a jump in operating costs weighed on profitability. Earnings before interest, taxes, depreciation and amortization, adjusted to exclude one-time effects and include dividends from subsidiaries, rose 16 percent to $2.73 billion, but missed a consensus estimate of $2.85 billion compiled by Thomson Reuters.
Revenue in the quarter rose to $7.24 billion from $6.16 billion last year. Analysts were expecting $7.33 billion.
Buoyed by strong steel demand from China, iron ore prices this week rose to about $70 per tonne, a level they are expected to maintain, according to Vale executives. However, some analysts warn that prices may slip due to expanding supply.
"Vale remains an evolving bottom-up story with the new management team and set for important corporate governance changes ahead," BTG Pactual analysts said in a client note. "Nonetheless, our cautious view on the direction of iron ore prices keeps us on the sidelines," they added. ($1 = 3.15 reais) (Additional reporting by Bruno Federowski in Sao Paulo; Editing by Brad Haynes and Matthew Lewis)