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"China has abundant gold mine reserves. By the end of 2017, China's proven reserves topped 13,195.6 tons, up 8.45 percent year-on-year," said Zhang Yongtao, vice-chairman of the China Gold Association. "China is also the world's leading gold manufacturer, with output topping the world's chart for 11 years in a row.

"By implementing projects such as sintering flue gas, desulfurization and using gas instead of coal, air pollution has been greatly reduced," Li said.

"Chile is shifting more and more of its volumes toward China," Ciobanu said. "Prices paid in Asia are coming down a bit as the market matures, but there's still a gap above what North America pays."

"But now there are opportunities to develop rural tourism. There's a spring where water temperature remains constant at around 22 C and the village is famous for its Zhuang ethnic culture," Zhang told.

"Causing flames to leap out of the pot is no longer new for the audience, so I have to think of new ideas and demonstrate new skills all the time."