PERTH, Australia, April 23, 2013 /CNW/ - Mirabela Nickel Limited ("Mirabela" or the "Company") (ASX: MBN, TSX: MNB) is pleased to announce its unaudited first quarter results for the period ended 31 March 2013.HIGHLIGHTSProduction for the quarter of 4,151 tonnes of nickel in concentrate (Q4 2012: 5,291 tonnes)Sales for the quarter of 3,907 tonnes of nickel in concentrate (Q4 2012: 5,044 tonnes)Unit cash costs of
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