I dug pretty deep down into/against the rock wall on the outside of the curve in the river but no luck. The Chinese who came to our gold rushes in the 1880s were known for their dogged picking through the tailings of the white mans diggings! We charged them a 100 Pound poll tax and many of them died before ever being able to return to China. One ship carrying a number of Chinese corpses sank on the way back. The Chinese have not forgotten the Opium Wars but seems like you may have. I think my sluice needs fine tuning and it was heartening to watch a video by a NZers who took 3 years of fossicking before he found anything. There's a lot to learn thats for sure...its not as easy as it looks on those TV shows.