GOLD is rare. More than 99.9% of the Earth’s crust is composed of oxides of silicon, aluminum, calcium, magnesium, sodium, iron, potassium, titanium and phosphorus.
So, for most of human history, people have become quite excited when they discover gold. Despite the serious environmental consequences of gold mining, including mercury and cyanide pollution and the devastation of landscapes, humanity has not given up the search – and seems unlikely to do so any time soon.
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