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Leaching Green Technology For Gold Mining

May 14 2013 May 14 2013 By Megan Fellman. EVANSTON Ill. --- Northwestern University scientists have struck gold in the laboratory. They have discovered an inexpensive and environmentally benign method that uses simple cornstarch -- instead of cyanide -- to isolate gold from raw materials in a selective manner. This green method extracts gold from crude sources and leaves behind other metals that are often found mixed together with the crude gold.

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