Look for YouTube vids on panning fine gold. Look for tapping method or shake and tap.
Basic steps:
1. Separate fine material from larger sand - use a 50 mesh screen or finer (buy in prospecting shop or use the sieve they sell in Asian food markets to wash rice!)
2. Use a magnet to remove any iron sand for separate processing
3. Use the shake and tap method on that fine material to see the ultra fine gold come dancing right out of the fine, iron-free sand!