Rinse and strain, once your back to product in clean water add a few drops of jet dry, which is a surfacant and will break the tension without having to deal with emulsification.
After than you should be able to pan off the super fines and suck them up manually along the line you create while panning.
Next time, when dealing with black sand, try screening it dry first. Run each mesh minus on it's own starting with the coarse and working down, when they are uniform you can get the gold off WAAAAAAY easier. Hope that helps.
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