kaserta,
It is good you have the sodium metabisulfite. Not meatabisulf-ATE, these chemicals are similar but do not react the same way in solution.
Really I am trying to help you learn, and know how to deal with any problem you run into.
Here is my suggestion to help you, forget about getting a few grams of gold from what scrap you have now, spend time collecting more scrap while you learn, building your stockpile, right now I feel you will lose more gold than you will get if you keep going down this road being not totally sure of how to do this.
Study Hokes book, spend time doing all of the getting acquainted experiments she tells you to do, learn how to make stannous chloride and use it.
While you are doing this you may also go to Laser Steve’s Website and study all he provides, also study processes on the forum.
Pick a very simple process study it well (like acid peroxide and then HCl/bleach method using memory fingers), learn everything you can about it, then do the same for other processes or materials later.
Recover your gold and refine it to high purity without losses, and melt that beautiful gold and show it to us for us to admire.
This would be a lot of work but you would find it worth it, you would know how to deal with anything you run into.
These I copied from Palladium's signature line, you should find link to Hoke’s book and other good information in them:
The difference between stupidity and genius is that genius has its limits. Albert Einstein
1. Refining Precious Metal Wastes C.M. Hoke http://tinyurl.com/mfnyhs
(REV) (Free Download)
2. Get the (FREE) Gold Refining Forum Handbook VOL 1 here >> http://tinyurl.com/nyutnp
3. Get the (FREE) Gold Refining Forum Handbook VOL 2 (Final) here >> http://tinyurl.com/y9w5y73
4. Chemistry Handbooks Here (FREE) >> http://tinyurl.com/n27pqu
ALL FREE-----ALL THE TIME
Hope you the best.