One important thing to keep in mind about AZX is that it owns 50% of the project, so its share of the resources is 1mn, not the full 2 mn.
Doesn't seem like there's any real reason to justify the gap in market caps of GGG and AZX (which is why I opted to go for AZX too and recently posted a message to longer-term followers of AZX asking the same). There's also a recent broker report (available on teh AZX site) which highlights the cheap EV/oz valuation of AZX relative to both Aussie miners and GGG.
AZX Price at posting:
52.3¢ Sentiment: None Disclosure: Held