Deploying an electron microscope, Dr. Kathleen Smith and her team spent eight years unearthing minuscule metal particles in treated solid waste. “The gold we found was at the level of a minimal mineral deposit,” Smith said, meaning that a similar dispersion in rock would be profitable enough for traditional mining. Other metals recovered include silver and platinum.

Sabrina Toppa Stinking Rich? Human Waste Contains Gold, Research Finds https://time.com/3755611/human-waste-gold-sewage-research/ March 24, 2015