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Gold Prospecting
Gold localities & information
Victoria information and questions
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<blockquote data-quote="user 4386" data-source="post: 295268" data-attributes="member: 4386"><p>"The average silver-content of gold bought by the Mint is 4 Per cent., but gold from Walhalla contained 15 per cent.; and from St Arnaud, 50 per cent".</p><p></p><p>In the weathering zone it is commonly 99.5% or purer gold. The silver gets leached out.</p><p></p><p>St Arnaud started as a silver mining field because the separated silver deposited in separate fractures and was running at 5 kg/t silver.</p><p></p><p>A similar thing happened with the copper in the Bethanga mines, giving high-grade copper ore (the richest in Victoria - which is not saying much....)</p><p></p><p>The bismuth that formed the maldonite at Maldon may be later than the gold - introduced to the veins when adjacent granite intruded the veins.</p></blockquote><p></p>
[QUOTE="user 4386, post: 295268, member: 4386"] "The average silver-content of gold bought by the Mint is 4 Per cent., but gold from Walhalla contained 15 per cent.; and from St Arnaud, 50 per cent". In the weathering zone it is commonly 99.5% or purer gold. The silver gets leached out. St Arnaud started as a silver mining field because the separated silver deposited in separate fractures and was running at 5 kg/t silver. A similar thing happened with the copper in the Bethanga mines, giving high-grade copper ore (the richest in Victoria - which is not saying much....) The bismuth that formed the maldonite at Maldon may be later than the gold - introduced to the veins when adjacent granite intruded the veins. [/QUOTE]
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Gold Prospecting
Gold localities & information
Victoria information and questions
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