Wangu goldfield deposit in Hunan province could yield over 1,000 tonnes of precious metal
Archived version: https://archive.is/newest/https://www.independent.co.uk/asia/china/china-gold-mine-discovery-world-largest-deposit-b2660388.html
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Gold extraction is quite destructive to the environment though, you need leaching agents, that contain Cyanide https://en.wikipedia.org/wiki/Prussic_acid. But with modern developments and best practices in the industry it should become easier to mitigate contamination of the environment.