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Gold Prospecting
Metal Detecting for Gold
Nuggets forming 'in situ'
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<blockquote data-quote="Heatho" data-source="post: 142262" data-attributes="member: 487"><p>Aqua Regia which is 3parts Hydrochloric Acid and 1 part Nitric Acid will dissolve Gold in to a solution known as Auric Chloride I think or Chloro Auric Acid. Then precipitation is done with Sodium Meta-bi sulphate. All this can occur at room temperature, though other methods and chemicals can do similar at higher temps and pressures and precipitate onto different minerals such as carbonates. This is why Gold can be trapped in Sulphides also until oxidization occurs and the Gold is liberated as free Gold. </p><p></p><p>This is the reason that reefs above the water table have free Gold in the oxidized zone and below the water table are the Sulphide types where Oxygen cannot reach.</p><p></p><p>Also read up on enrichment zones and deletion zones in the Victorian Goldfields and Gold forming in situ percolating in the ground makes a lot more sense.</p></blockquote><p></p>
[QUOTE="Heatho, post: 142262, member: 487"] Aqua Regia which is 3parts Hydrochloric Acid and 1 part Nitric Acid will dissolve Gold in to a solution known as Auric Chloride I think or Chloro Auric Acid. Then precipitation is done with Sodium Meta-bi sulphate. All this can occur at room temperature, though other methods and chemicals can do similar at higher temps and pressures and precipitate onto different minerals such as carbonates. This is why Gold can be trapped in Sulphides also until oxidization occurs and the Gold is liberated as free Gold. This is the reason that reefs above the water table have free Gold in the oxidized zone and below the water table are the Sulphide types where Oxygen cannot reach. Also read up on enrichment zones and deletion zones in the Victorian Goldfields and Gold forming in situ percolating in the ground makes a lot more sense. [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
Nuggets forming 'in situ'
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