pen-pit mining is a type of large-scale mining that extracts minerals found in low concentrations from the surface of the earth rather than from tunnelling, generating large craters. This method requires large amounts of explosives and water, and the use of chemicals such as cyanide and sulphuric acid for the separation of metals.
read more... http://theconversation.com/the-argentinian-fight-against-mega-mining-95672
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