I suspect a chunk of the game hasn't been put into the aphas/beta.

You've probably long sold this off, but in case you or anyone is wondering, the only other use is in making the honey lure for bug catching later on! If you're not interested in that, feel free to sell these for those sweet, sweet coins~

AFAIK, Gold and silver bars are just for selling/profit. There is only one crafting recipe that requires a single silver bar (some mirror).

I don't believe there's any uses right now but I could be wrong. Asking in game might get you some better answers