cyanide is applied to the ore to make the gold dissolve into solution, but this chemical “leaching” can have detrimental effects on the surrounding environment. In open pit mining, a large hole is dug to get to the gold ore. Dynamite is also often used to find gold. All of this displacement of earth effects the environment. On average, 400 tons of rock is dug up – and only 4 ounces of gold is found in that rock. Similar mining methods are used to find diamonds and other precious metals.
http://pure-green-living.com/what-is-eco-friendly-jewelry/
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