In this article we will take you to some gigantic manmade holes: open pit mines. We''ll show you the biggest, deepest and deadliest mines in the world.
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Turquoise is an opaque, bluetogreen mineral that is a hydrated phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O. It is rare ...