you might want to check out the silver magnet.
you send the electrode covered with silver back to the manufacturer in the bag they provide and they will give you money for your silver.
the devices do not cost very much, they work very well, and pretty much pay for themselves.
there are no minimum levels of silver you need to have on the electrode ( you can send it back with 1/2 troy oz or 30 troy oz )
there are no minimums or fees involved ( except for a few percent of the total for overhead ) ...
if you want to get the silver out of your waste stream this might work for you.