No single event illustrates this more than the recent tragic events in Zamfara State in northwestern Nigeria. It was supposed to be the World Environmental Day celebration on 5 June 2010 but the inhabitants of gold-bearing communities Anka and Bukkuyum and local governments in Zamfara State had a different fate in stock for them.

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Jul 07, 2020· The Miller process uses gaseous chlorine to extract impurities when gold is at melting point; impurities separate into a layer on the surface of the molten purified gold. The Miller process is rapid and simple, but it produces gold of only about 99.5 percent purity. The Wohlwill process increases purity to about 99.99 percent by electrolysis.

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