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
Ways to Strength and Beauty feature Leni Riefenstahl. Ways to Strength and Beauty Ways to Strength and Beauty () is a 1925 German silent film directed by Nicholas Kaufmann and Wilhelm Prager. The film was produced by Ufa-Kulturfilmabteilung of Weimar Germany. The action was an idealized, somewhat naive depiction of health and beauty in conformity with nature. The film offered a contrast to the rather hopeless lifestyles available in Berlin and other large cities of Germany during the twenties and became an immediate success. Finally it became the most popular and most important German "kulturfilm" of this period. The film is best known as the