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Hydraulic mining in those days involved channeling water from snowmelt and glaciers into a large pipe. As it dropped downhill, you reduced the size of the pipe, increasing the water pressure. A man with a hose could move as much gravel in a day as 12 men could in a week with shovels. The force of the water when it came out of the hose could cut a man in half. It says so right there on the sign; do I look like a guy that would spin a yarn?