Solid Gold
Although sewers are designed to collect waste, not everything that ends up there is worthless. In Japan, for example, workers at a treatment facility received 5 million yen in gold in 2009. They were sifting through sludge when they discovered the precious metal. They were able to use the metal because of the large number of precision equipment manufacturers in the area. They discovered 1,890 grams of gold per ton of garbage!
Solid Gold
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