22-carat gold may be hidden in household items treated as scrap, while Swiss scientists use whey to recover the precious metal and pave the way for new sustainable urban mining.

The gold may be hidden in household items that many people treat as junk, such as old cell phones, routers, modems, motherboards, televisions, and even unused appliances. The metal appears in small but valuable quantities in the internal circuits of these devices.

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22-carat gold may be hidden in household items treated as scrap, while Swiss scientists use whey to recover the precious metal and pave the way for new sustainable urban mining.