Gold mined from sewage sludge in Japan
A sewage plant in Japan's Nagano Prefecture earned a cool 5 million yen ($56,000) in its first month of operation when mining gold from sludge. The sewage plant operator, Nagano Prefecture Suwa Construction, announced on January 28 that approximately 1.9 kgs (4.2lbs) of gold could be mined from each ton of molten fly ash …