My Brother Les with another day's cleanup. There was a little seam along the lag line that was a consistent producer of heavy gold. What I call the lag line is where the subsequent erosion and the incisor events concentrated the gold. As a stream placer is forming from ancient continental environments, Many of these deposits experience high energy events.
Streams fan out as gradients decrease, heavy minerals have a tendency to collect on these low energy areas. As the gradient increases, the stream is continuously attacking the bedrock and as it starts eroding, the settled rock, sand and the concentrated mineral, starts on the move as the water cuts another stream incisor. This causes in many cases the classic debris flow many miners observe in their mining operations.