Summary: any gold. We decided to move up to a sluice box . Instead of picking up a couple of handfuls of sand from the river bottom, this entailed taking out shovels and digging into the river bed. The first challenge was to even be able to dig in the river bed since it was quite rocky. With much effort (and what would make me sore for the next few days) we placed shovel fulls of rocks
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Image originally found here.