Great Geode Trade is a seasonal quest. It expires at the end of Summer but will be available again the following year.
Quest Description[]
I've seen you in the caves collecting geodes, if you have some extras I've got some ore to trade.
Bring me 20 Geodes and I'll give you 10 Silver Ore and 10 Copper Ore for them.
Sure you might get gold from your geodes, but you might get stone. If you want to trade, bring me the geodes before the end of Summer.
Quest Completion Description[]
Great choice, here's your Copper and Silver. Wish me luck, I hope I find Gold.