Gold extraction the purity of gold. The parting of gold from silver has been done since ancient times starting in Lydia in the 6th century BC. Various techniques have been practised; salt cementation from ancient times, parting using distilled mineral acids from medieval times, and in modern times using chlorination using the Miller process and electrolysis using the Wohlwill process. Gold extraction Gold extraction refers to the processes required to extract gold from its ores. This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore. Gold mining from alluvium ores was once achieved
Dumb Ways to Die Ways To Die" will." McCann estimated that within two weeks, it had generated at least $50 million worth of global media value in addition to more than 700 media stories, for "a fraction of the cost of one TV ad". According to Metro Trains, the campaign contributed to a more than 30% reduction in "near-miss" accidents, from 13.29 near-misses per million kilometres in November 2011 – January 2012, to 9.17 near-misses per million kilometres in November 2012 – January 2013. The video was animated by Julian Frost and produced by Cinnamon Darvall. It was uploaded to YouTube on 14 November