"Researchers at Arizona State University have quantified the amount of metals that winds up in sewage sludge and calculated its potential worth. Samples were collected from across the U.S. and it was discovered there could be up to $13 million worth of metals in the sludge produced by a city with a population of one million annually. that includes $2.6 million in gold and silver."

From +The Weather Network: http://ow.ly/HF1V2 

News – There could be millions of dollars worth of gold and silver in sewage sludge – The Weather Network
As it turns out, one tonne of the sludge that’s left over when treating sewage waste could contain a significant amount of precious metals like gold and silver, potentially generating millions of dollars in revenue each year.

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