You should search for a vein of more white quartz, This was a clue to gold hunting here in north Georgia. I have panned for gold and when you rid the large pebbles from the pan and have black sand it's highly likely you will find fine flakes. Not something you would quit your job for but it will fascinate you like an infection. Don't know where you are and if there is a history of gold in your location. It's easy to find black sand in your creeks. Quartz is a clue so give it a thought.