urban mining

(名詞/不可數) 城市採礦 - 從已被丟棄的電池和電子裝置等物品中拆除和回收金屬零件。

As well as requiring good collection and recycling systems, urban mining relies upon people handing over products they no longer use. British charity WRAP (the Waste and Resources Action Programme) recently estimated that as many as 125 million mobile phones are being hoarded in people's drawers and cupboards in the UK alone.
[opendemocracy.net, 15 March 2022]