And that's not all...

  Precious metal scrap is generated in many industries. The chemical industry produces large quantities of silver impregnated alumina scrap. The plating industry generates gold, silver, platinum and palladium scrap in such forms as anodes, chemical salts, precipitates and resins, as well as hooks and fixtures used to hold parts in plating. Electrical manufacturers generate contact scrap in appliance time regulators, switches and wiring.

  Communications scrap includes palladium contact points and telephone components. Dental laboratories produce high value scrap in gold, palladium and platinum crowns and silver mercury amalgam. Aircraft scrap includes precious metal bearing wave guides, engine bearings and turbine rings.  
  The list is a long one. And it keeps growing. As new industrial uses are found for precious metals, new opportunities continually arise for profitable precious metals recovery. Mine dore gold and silver. Chemical waste silver impregnated alumina catalysts.
Defective eyeglass frames. (Nothing defective about the gold in the frames.) Copper switches with silver cadmium oxide contacts. Dental amalgam, containing mercury and silver.