Others may not value this method but, holding the faucet by a thin edge, strike it with a small hammer or knock it against a metal surface. Aluminum clunks, steel chimes, copper hums, and brass rings. It's not 100% but, since I rarely have a grinder to test things offsite, this method lets me do some initial sorting, at least enough to know if it should or shouldn't go in the ferrous pile.
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