Mining involves drilling, blast, screening, and many other procedures to extract materials from the Earth. It can lead to release of mercury and cyanide.
Where are cyanide and mercury released?
Mercury is released to the environment through activities like gold mining which is used to extract gold from its ore.
Cyanide is the primary reagent used for mining gold as it aids in the efficient extraction of gold from its ore.
Thus, the correct option is A.
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