Don't give up on your gold. It's a great experience to learn things when they go wrong. Like you said it was a costly lesson. Learn from it above all else. One thing i would like to clarify that Geo said and not to contradict him but, If you add more silver than you need to inquart then when you dissolve the silver out your gold won't stay in sponge form but it will break down into very fine particles of gold which will be harder to deal with.