copper and electrum ancient egypt, Headrest of Hetepheres I

In the middle of the Tang Dynasty, due to the limited mining capacity of metals in ancient times, less copper was produced. At the height of Buddhism at that time, the copper minted was also used for the casting of Buddha statues, so the amount of copper used for coining was gradually reduced, which greatly affected the amount of coins minted at that time. Moreover, due to the unprecedented frequency of foreign trade transactions, there were a large number of countries and the Tang Dynasty business close, which led to a large amount of copper money flow.

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