Reported yield on silver mica capacitors are close to 1 once of silver from 1 pound of capacitors. Go to the gold refining forum and do a search for Lasersteve silver mica capacitors. Being the case of silver the smaller the capacitor the yield will be less per pound.
You need to also look for through hole monolithic capacitors. These will be small oval shape kind of like a tic tac usually with yellow epoxy coatings. Look for small square blue epoxy coated to. The leads on monolithic capacitors will be spaced equally on the capacitor.
This is where a high Palladium content may come in to the picture. Through hole monolithic capacitors are the same as the MLLC capacitor that is used today.
Plain ceramic disc capacitors the leads will be off set with a lead going to each side.
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