《明史·志·卷五十八》
后来，皇帝一天天贪求财货，开采的提议大肆兴起，花费以巨万来计算，珠宝价格比旧时增加二十倍。
久之，帝日黩货，开采之议大兴，费以钜万计，珠宝价增旧二十倍。
Later, the emperor wanted more and more money every day, and the proposal to mine it was in full swing. The cost was calculated in hundreds of millions, and the price of jewelry increased twenty times compared with the old days.