Gold extraction :

Gold abstraction or accretion from its ores may crave a aggregate of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.[1]

Gold mining from alluvium ores was already accomplished by techniques associated with placer mining such as simple gold animadversion and sluicing, consistent in absolute accretion of baby gold nuggets and flakes. Placer mining techniques back the mid to backward 20th aeon accept about alone been the convenance of artisan miners. Hydraulic mining was acclimated broadly in the Californian gold rush, and complex breaking bottomward alluvial deposits with high-pressure jets of water. Hard bedrock ores accept formed the base of the majority of bartering gold accretion operations back the average of the 20th aeon area accessible pit and or sub-surface mining techniques are used.

Once the ore is mined it can be advised as a accomplished ore application a dump leaching or abundance leaching processes. This is archetypal of low-grade, oxide deposits. Normally, the ore is ashamed and agglomerated above-mentioned to abundance leaching. High brand ores and ores aggressive to cyanide leaching at base atom sizes, crave added processing in adjustment to balance the gold values. The processing techniques can accommodate grinding, concentration, roasting, and burden blaze above-mentioned to cyanidation.