Selling/Scrapping Used Circuit Breakers Silver Recovery

If you are worried about heavy metals, you may not want to be in the scrapping business - there is a lot of nasty stuff in scrap.
As far as circuit breakers - a few cents each is the scrap value. Some have more silver, some have less silver.

Put the breakers in a cloth bag, smash it with a hammer, and TEST the results for silver bearing metals. Most modern breakers will have a few milligrams worth of recoverable silver. You may be lucky enough to find an old breaker with 1 or more grams, but that seems to be rare. Most breakers and relays have silver-alloy contacts.

Remember to TEST all items for silver - never assume something is silver just from looking at it !!!
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On a side note: platinum and iridium spark plugs have $0.02 - $0.05 worth of metal in the contacts.