銀山
Silver mining was increased dramatically during the reign of the Yongle Emperor (1402–1424); production of mined silver rose from 3007 kg (80,185 taels) in 1403 to 10,210 kg (272,262 taels) in 1409. The Hongxi Emperor (r. 1424–1425) attempted to scale back silver mining to restore the discredited paper currency, but this was a failure which his immediate successor, the Xuande Emperor (r. 1425–1435), remedied by continuing the Yongle Emperor's silver mining scheme. The governments of the Hongwu and Zhengtong (r. 1435–1449) emperors attempted to cut the flow of silver into the economy in favor of paper currency, yet mining the precious metal simply became a lucrative illegal pursuit practiced by many.