Tianjin cost 27,000 taels of silver but the cost of making a single string of machine-struck 1 qián cash coins more than twice as high as their face value forcing the Tianjin mint to buy more furnaces until it eventually had to close down in 1900. Guangxu's reign saw the reclamation of Xinjiang and the presuming of minting red cash there, while Japanese experts revitalised the copper mining industry in Yunnan and many new veins of copper were discovered giving the government more resources to cast (and later strike) coins again. The new coins often bore the inscription Guāng Xù Yuán Bǎo (光緒元寶) with an image of a Dragon and featured English, Chinese, and Manchu inscriptions. Further these coins tended to have their relation with China's older coinages (most often with cash coins) on the bottom, or their value in relation to silver coinage, and the Manchu words indicated the place of mintage. Meanwhile, the 10 wén "traditional" cash coins were discontinued as the production of these more modern coins began. In 1906 the General Mint of the Ministry of the Interior and Finance in Tianjin started issuing a new copper coin called the Dà Qīng Tóng Bì (大清銅幣), which like Guāng Xù Yuán Bǎo coins featured the image of a Chinese dragon, and had English, Chinese, and Manchu inscriptions with the English inscription reading "Tai-Ching-Ti-Kuo Copper Coin" in Wade-Giles, coins minted under the Guangxu Emperor featured the inscription of the Chinese characters Guāng Xù Nián Zào (光緒年造). These coins were minted in denominations of 2 wén, 5 wén, 10 wén, and 20 wén and would soon be issued by various mints across the Chinese provinces. These coins were first issued by the Ministry of the Interior and later by the Ministry of Revenue and Expenditure. Coinage under the Xuantong Emperor Under the Xuantong Emperor both traditional copper cash coins, and modern machine-struck coins continued to be minted simultaneously, though only the Ministry of Revenue in Beijing and a few provincial mints continued to cast traditional cash coins as most mints had started to exclusively produce machined coins, and Kucha was the only mint still operating in Xinjiang casting "red cash" under the Xuantong Emperor. Under the Xuantong Emperor Beijing's 2 central government operated mints would close. In 1910 new machine-made coins were issued. New denominations introduced in 1910 include: These denominations weren't produced in large numbers as the Qing