pay dirt
 有價值的礦藏,豐富的礦藏,有利可圖的發現


 Pay, n.
 1. Satisfaction; content.
 2. An equivalent or return for money due, goods purchased, or services performed; salary or wages for work or service; compensation; recompense; payment; hire; as, the pay of a clerk; the pay of a soldier.
    Where only merit constant pay receives.   --Pope.
    There is neither pay nor plunder to be got.   --L'Estrange.
 Full pay, the whole amount of wages or salary; maximum pay; especially, the highest pay or allowance to civil or military officers of a certain rank, without deductions.
 Half pay. See under Half.
 Pay day, the day of settlement of accounts.
 Pay dirt Mining, earth which yields a profit to the miner. [Western U.S.]
 Pay office, a place where payment is made.
 Pay roll, (a) a roll or list of persons entitled to payment, with the amounts due; now usually one word, payroll. (b) the total sum of money which is paid to all employees on payday.

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 Pay dirt, Pay rock, etc.
 1. Mining Earth, rock, etc., which yields a profit to the miner. [Western U. S.]

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 pay dirt
      n 1: ore that yields a substantial profit to the miner
      2: a profitable success; "the inventor worked for years before
         hitting pay dirt"