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
The Essence of Black Purity The Essence of Black Purity The Essence of Black Purity is the third release by the black metal band Watain. It was released in 1999 on EP format on Grim Rune Records and was limited to 300 copies. Grim Rune website mentions that the EP "got a generally good response in the underground circuits." Similarly, Eduardo Rivadavia of "Allmusic" wrote that Watain "quickly gain[ed] underground credibility" with this "uncompromising 7" release". When asked his opinion about Watain's older albums, vocalist Erik Danielsson said: "I appreciate them for what they are, monuments of what we were before, pieces of evolution. The