Dec 2 (Reuters) - Australian gold miner Northern Star Resources NST.AX said on Monday it will buy De Grey Mining DEG.AX, valuing the smaller miner at A$5 billion ($3.26 billion).
($1 = 1.5356 Australian dollars)
(Reporting by Aaditya Govind Rao in Bengaluru; Editing by Chris Reese)
((Aaditya.GovindRao@thomsonreuters.com;))