A Western grafter (con man) is discussing women as grafters.
"Man is the hardest proposition a woman has to go up against. He's the low-grade one, and she has to work overtime to make him pay. Two times out of five she's salted."

The scam of kiting value of a mine by burying moderate amounts of gold ore in a worthless mine where suckers could
find it and think the mine was vaulable was called
"salting".