russia won the most gold metals in olympics.
who won the most gold metals in olympics?
russia
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cyanide extraction of gold may be used in areas where fine gold-bearing rocks are found. sodium cyanide solution is mixed with finely ground rock that is proven to contain gold or silver, and is then separated from the ground rock as gold cyanide or silver cyanide solution. zinc is added to precipitate out residual zinc as well as the silver and gold metals. the zinc is removed with sulfuric acid, leaving a silver or gold sludge that is generally smelted into an ingot then shipped to a metals refinery for final processing into 99.9999% pure metals.
gold mining