"Salt the mine" nghĩa là gi?

"Salt the mine" có salt là rắc thêm muối -> cụm từ này nghĩa là đổ thêm quặng (từ nơi khác) vào mỏ để trông có vẻ lời lãi.

Ví dụ 

It turned out that they'd salted the old abandoned mine with low-grade gold deposits to convince us to buy, then skipped town with the money.

Neil Brown, employed by a large Eastern syndicate, is sent west to examine and perhaps purchase a silver mine owned by Fred Harvey. Harvey is advised of the easterner's coming and determines to "salt" the mine to insure the sale.

One way to lure more of those dollars to Milwaukee is to salt the mine. Major companies in Milwaukee could take the lead in forming what is commonly called a "fund of funds," a vehicle for pooling capital and investing in emerging firms.