BRIEF-Vale CEO expects nickel prices to improve in second half
July 30 (Reuters) -
* Vale CEO says firm has made up most of its cash-flow deficit with asset sales
* Vale CEO says expects nickel price to rise in second half of 2015
* Vale CEO says no decision made yet about whether to go ahead with IPO of base metals unit
* Vale says it is not closing any iron ore mines as part of phasing out some higher-cost production Full results story: Further company coverage: (Reporting By Stephen Eisenhammer)
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