With gold trading at $6,375/oz today, three mothballed nickel concentrators — Black Swan, Cosmic Boy and Lake Johnston — are at various stages of refurbishment as new owners seek to produce gold."Every man and his dog is putting through every stone that's got gold in it, so all the mills are full with the high gold prices," said Grant Haywood, managing director of Kalgoorlie gold miner Maritana Minerals, which owns Black Swan It's probably a matter of when, not if, the nickel price turns, and you can then use it as a multi-purpose plant, not only producing gold but nickel as well."Once commissioned, Black Swan is expected to support 60 jobs, while Mr Haywood said another 300 workers would be employed at various mines feeding it