I don't want to be a Debbie downer, but don't bother asking about this on the gold refining forum. They are most likely going to berate you, and insist you read a famous book about refining, even though you don't want to actually refine them yourself. You will be lucky to not get completely banned from that forum just for asking this question there.
You would be better off selling them as is and buying Gold as was mentioned above. Unless you really like jerks, avoid the Gold refining forum.
Bookmarks