They would be a good example of a Government make work program. The Gov has the money to do a 3D map as part of the planning stage as it would set the processing steps as well as the final landscaping. Using the photo above the river would be changed as the untouched area would be included and as the piles are moved the bedrock has to washed and vacuumed bare. I mention that as the water would have allowed gold to sink lower than the original dig could clean out. 1,000 machines that are all owner operator with the Gov financing it all and buying the machines back at the end of about 20 years of hard work.
White water gold would be a blessing to the chopper industry. When the Gold Rush show was on they had to move a big rock from upstream and when it stopped downstream of the hole they were cleaning out it raised the level of the water a bit. If they added to that the water coming past the hole would be a few feet higher and at a low flow rate the hole should be in 'calmer water'. The tailings could be added to the dam so it was in place year after year and every 10 years they would clean the hole out again.
White water gold would be a blessing to the chopper industry. When the Gold Rush show was on they had to move a big rock from upstream and when it stopped downstream of the hole they were cleaning out it raised the level of the water a bit. If they added to that the water coming past the hole would be a few feet higher and at a low flow rate the hole should be in 'calmer water'. The tailings could be added to the dam so it was in place year after year and every 10 years they would clean the hole out again.