It's been an excellent September so far for copper mining stocks, with Freeport-McMoRan (NYSE: FCX), First Quantum Minerals (OTC: FQVLF), Ivanhoe Mines (OTC: IVPAF), and HudBay Minerals (NYSE: HBM) all rising despite a recent correction. The moves highlight the volatile nature of commodity stocks and some reasons why putting money into copper miners is an attractive theme for investors.  

The key factors behind the move come from near- and long-term catalysts:

These factors are interlinked. No company will launch a bid for another unless it believes the target has attractive assets, and for that, it has to think that the long-term supply/demand situation is favorable. 

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Source Fool.com