Manufacturing made Michigan, all of Michigan very middle class wealthy for a lot of years. It's only recently been a poor state. That is why I research the locations of 100+ year old resorts and go there and find plenty of Gold and silver.
I don't bother trying to find freshly dropped jewelry, it's a waste of time. Tungsten, plated copper and stainless steel.
The people decades ago had the money and lost the real jewelry and pockets full of silver coins.