Valley of Fire (1951)
Breezie Larrabee: Gold! A pure nugget as big as your eyeball. It's a bonanza! I've hit paydirt. Maybe the mother-in-law lode.
[A well-dressed stranger claims to have found a gold mine]
Breezie Larrabee: If that manicured dude ever turned a spade, it was on the bottom of a deck of cards.