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1.
A girl who's into older men. If the girl's under 18, she's a "silver minor."
"I can't believe Julie is flirting with that 65-year-old professor -- she's such a silver miner."
by iamelevenninjas April 29, 2008
 
2.
A woman who goes after someone who has more than average money. She shoots a little lower than gold diggers, but she's still in it for the money.
Gwen is such a silver miner! She didn't marry a millionaire in Paul, but he's got money since his family owns that local business.
by flacker November 21, 2005