Not using nanobots, but some municipal waste incineration plants are already recovering valuable metals. A more recent development is using dry discharge of bot

Not using nanobots, but some municipal waste incineration plants are already recovering valuable metals. A more recent development is using dry discharge of bottom ash to recover >95% of all metals [1]. From 100 000 metric tons of clinker, ZAV Recycling AG in Hinwil (Switzerland) is extracting 60kg of gold, 1500kg of silver and 800 metric tons of copper each year. [1] http://www.hz-inova.com/cms/wp-content/uploads/2016/03/04b_Residue-Recovery-ZAV_R-Müller_E.pdf http://www.hz-inova.com/cms/wp-content/uploads/2016/03/04b_R...