“ ... The two hired men dug for four months without success: with high pressure hoses they scoured great pits into which the trees collapsed; they turned the clear waters of the forest stream they excavated red with clay and tailings; they winnowed the gravel through meshed boxes; they dissolved the residues in mercury and burned it off; but they produced almost nothing. Then they hit one of the richest deposits ever discovered in Roraima: in one day they extracted 4kg . .” Read this fascinating article about goldmining in Brazil by George Monbiot in The Guardian
https://www.theguardian.com/commentisfree/2013/dec/23/gold-guns-greed-rat-poison-brazilian-jungle-miners
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