都と市し鉱こう山ざん

noun

urban mine

Refers to discarded electronic devices and other urban waste that contain valuable metals and can be recycled as resources.

• 使し用よう済ずみの携けい帯たい電でん話わは都と市し鉱こう山ざんと呼よばれる資し源げんの宝ほう庫こだ。

  Used mobile phones are a treasure trove of resources called urban mines.