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
Political Order and Political Decay: From the Industrial Revolution to the Present Day Political Order and Political Decay: From the Industrial Revolution to the Present Day Political Order and Political Decay: From the Industrial Revolution to the Present Day is a 2014 book by Yoshihiro Francis Fukuyama, author of "The Origins of Political Order", written to shed light on political development in different regions. Fukuyama stresses the importance of the three pillars of the modern state, as described in the first volume: These ideas are exemplified throughout the first and the second part of the book via different cases. Fukuyama makes the argument that patronage behavior is rooted in the following biological roots: