Just take the gold and then use a hammer and a steel doll and hammer the gold till it takes the form of sand particles. Then take a steel pot and pour the gold in it. Then pour some water. When the water comes to the boiling point pour Nitric acid in the pot and let the other particles evaporate from the substance.
Just suck up as many of the little shiny bits of gold as you can, while trying to get as little of the black sand as possible. Sometimes I use my finger to push the little bits of gold together into one spot, out of the bulk of the black sand mass, before sucking them up with the sniffer bottle. There is still gold in that black sand.
Dry the sand containing the fine gold, placing it into a metal pan and heating it using a portable hot plate. Use a medium heat for 15 to 20 minutes and perform the task in an outdoor area with good ventilation. Turn the heat off and allow the sand to cool.
The tiny gold you find in sand is a unique challenge different than most other types of mining. It is possible to recover good gold though. Realistically I think it is possible to get several grams per day, but you need to be in the right area, with the right equipment and do everything just right. It can be done.
Assuming your uncle is an amateur , the only safe way of extracting gold is by gravity. The problem is that the gold dust is very fine, and may be...
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Place the remaining concentrates in the bottom of a plastic gold pan with an inch of water. Spread them out across the bottom of the pan, and hover your magnet just above them. The goal here is to actually cause the black sands to jump out of your gold pan.