They're "gold" rather than actual gold. I don't know the actual answer, but they're pretty bronze-colored so my guess would be "no". However, the kanohi in the comic are fairly weathered so you could say it's "gold" reasonably I think; plus the silver masks aren't chromed like the chromed silver masks, so it is possible.
I picked up Kopaka Nuva the other day at Target since the dropped the price a buck. It's an ok figure, but the armor ain't interesting enough to warrant the extra dough and the continued lack of a neck joint is disappointing. Plus, the kanohi is way too extreme. I dig the weapons/skates though, so I am considering maybe getting Lewa Nuva as well.
I'm really looking forward to the new enemies coming up, the Bohrok were ok but these guys look way more interesting.