iron cash coins were mainly minted by the Ministry of Revenue mint and Ministry of Public Works mint in Beijing, afterwards the government of the Qing dynasty established a specific iron cash coins mint, known as the iron cash office (鐵錢局). The iron cash office also stored the iron cash coins. While the actual production numbers of iron cash coins remains unclear because of the limited entries about them in the records maintained by the Qing treasury, Peng Xinwei estimated, based on information he had gathered from Qing government memorials, that there had been an average annual production of 1,808,160 strings of iron cash coins between the year 1854 and 1855 and an annual production of 1,360,920 strings of iron cash coins during the years 1856 until 1859. In January of the year 1855 the province of Zhili started casting iron cash coins, a trial casting for a single year was to deliver 120,000 strings of standard cash coins to be brought to Beijing. This work was then carried out by one of the Chinese branch mints with 10 furnaces that was located just outside of the western suburbs of Baoding by the Lingyu Temple (靈雲宮). In May of the year 1857, the four existing copper furnaces of the main Zhili provincial mint in Baoding were altered to be iron cash coin furnaces and a new iron cash coin furnace added, while at the same time 10 new furnaces for the production of iron cash coins was added to the Zhili branch mint. The Zhili provincial mint had ceased the production of 10 wén iron cash coins in June 1857. Iron cash coin mints were also planned to be opened in the cities of Tianjin, Zhengding, and Daming for the production of 1 wén iron cash coins, but only Zhengding had established a mint for iron cash coins which had 10 furnaces in operation. In July of the year 1859 there were a total of 35 furnaces for the production of iron cash coins in the cities of Baoding and Zhengding and at that time around 1,000,000 strings of iron cash coins had been cast at both mints. Because the Chinese people weren't using iron cash coins it was reported that 30 furnaces in Zhengding (which presumably also includes the furnaces of the Zhili provincial branch mint) were to be closed. In November 1859, the remaining 5 iron cash coin