Sewage Sludge Gold

Traditional prospectors would consider sewage sludge financially feasible due to the presence of commercially viable levels of gold, silver, and platinum in trace amounts. An 8-year research project discovered that one kilogram of sludge included around 0.4 milligrams of gold, 28 milligrams of silver, 638 milligrams of copper, and 49 milligrams of vanadium.

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