Dear bildon;
Black sand, while being a great indicator of where gold SHOULD be, is not always accurate. I've located gold where there were no black sands and I've also located black sand deposits that didn't hide even the tiniest morsel of gold. However, for the most part, when you've located black sand you also stand a very good chance of being close to a gold deposit.
Therefore, the absence of black sand in your gold pan or sluice should NOT be used as a concisive indicator as to the contents of the fine yellow particles you are recovering my friend. If you have a sufficent amount of yellow particles, place them in a steel or iron dish and heat the bottom of the dish with a propane torch. If they melt and stick together to form a molten glob, then the contents are not either mica or feldspar.
Once the globule cools, you can proceed by doing a scratch test by making a yellow streak on a flat piece of black slate and then placing a droplet of nitric acid on top of the streak. If the streak remains unchanged by the droplet of acid then you have gold.
Your friend;
LAMAR