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  1. Here is Washington state we have seasons on placer mining to work around the salmon and steelhead spawning seasons , but if you are running an electric pump powered by a battery and your high banker riffle area is 3 square ft or less you can run it year round, mine is powered by a 3700 GPH sub pump , it does recover more gold than I had originally anticipated , I am using miners moss and expanded metal in the box... Has anyone else tried this method yet , I am also using a RV 12 volt battery it runs this unit up to 12 hours..