How many pounds of those pins do you have? if you have several pounds I would save them till you are ready, if you do not have several pounds, I would save them and collect some more material.
it normally takes pounds of waste to get a few grams of gold.
Recovery and refining take time to learn, it can take several years even to learn the basics well, and I believe a man could study this his whole life and never learn all there is to it. also it is a skill that can take some time to master, or at least get to the point where you can do it, and do it where you are safe with yourself and others.
We deal with very corrosive acids and many times combinations of acids that are so corrosive they will dissolve the most acid resistant metals on our planet, which also form very corrosive and toxic gases, some of these gases were used in war, and even death chambers.
We have to also learn to deal with toxic waste we generate from the metals and acids, so that we do not poison others with these poisonous metal solutions, and understand how to deal with the waste so that it does not get into the drinking water of us or other people, as if left untreated and disposed of properly these solution can also leach there way down through the earth into the drinking water deep underground, or end up in rivers or streams where whole towns get there drinking water.
Besides the toxic gases and risks of poisoning yourself or others, there is even risk of mixing up some metal and chemical that has the potential to make an explosive substance in the glass you hold in your hand looking into this glass to see the reaction inside, there are several other dangers you will need to be aware of and protect your self and others against, that is where education is the first step in gaining the understanding needed to prepare yourself for that protection.
Like many skills a man may wish to learn it can take a lifetime trying to improve his skills in this art, even after he has come to the point where he has mastered the recovery and refining processes in general, each material and combinations of metals may take somewhat different processes, and many times even the simplest of scrap may take learning several different processes to be able to recover and refine the metal, on top of that sometimes there can even be different processes one could use or choose to use to recover that metal, this is why it can be hard to come up with or write a specific process of how to recover and refine the circumstance can be different even when recovering or refining two different batches of the same type of metal scrap, and you may have to adjust the process accordingly.
To recover and refine metals, you will be dealing with the chemistry of metals, each metal reacts somewhat differently in acids and bases, which can give us a way to separate these metals using that chemistry, recovery and refining is also a skilled art, that takes some time to master, you do not have to understand the chemistry in great detail to learn this art, but you do need to learn enough of its chemistry to be able to understand how these metals react to chemically in differing conditions, and the better you understand that chemistry the better you will be at this art, the more you understand of chemistry the more you will also understand in how the reactions occur and why.
C.M. Hokes book will help you understand the chemistry, but this book does not teach you the chemistry, but introduces you to it, the author Calm Morrison Hoke in her book she speaks in layman's terms to teach enough of the reactions of how these metals react chemically, to help jewelers learn how to recover metals from their waste, although she was a chemist she does not go into the chemistry of these metals in any great depth, but does a great job of introducing you to the basics principles of the metals chemistry, to help you to understand how to separate these metals from each other chemically from each other, by doing the getting acquainted experiments in her book, it helps you get the hands on experience you need to recognize the reactions and how many of these metals react differently with the different acids, how some metals would become problems if they were in solutions with certain acids or even with our gold in the same solution.
The forum is a huge library a collection of most anything related to this field, this library here on the forum may be the biggest and best collection of material in the world on this subject. The knowledge help and shared among members here on this forum has been kept secret from man, since man began finding and recovering precious metals through out history, as these metals often meant wealth and power throughout history, many times these skills were kept secret or surrounded in mystery or magic to keep others from learning the skills, Here on the forum we have been lucky enough to have some professionals in this art to share many of those secrets with us, and also share from there lifetime of work in the skills of this art. The forum is like a university, most likely the best university in the world to learn this art.
If you asked me how to get the gold off of those pins I would say you dissolve the different metals with acids and precipitate them back out of solution. but if you wish to learn how to do it, you will need to be willing to spend quite a bit of time studying, which in itself is actually where most of the fun is in this field of work.
Welcome to the forum I hope this helps you get an understanding of where you need to begin to learn to get the gold off of those pins.