I think I read somewhere that Romex was 60 percent copper but I guess it depends on what gauge. We can't sell stripped wire here in AZ so I never bothered to do the math on it myself.
But I do think the 3lb to 1lb ratio is off. At 60 percent it would be 1.8lb per 3lb. For it to be only 1lb per 3lbs the recovery rate would be 33 percent. I know for a fact it's more than 33 percent.
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