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Gold Prospecting
Hard Rock Gold Prospecting
Home sampling finally started
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<blockquote data-quote="SWright" data-source="post: 115666" data-attributes="member: 1541"><p>G'day ProspectorPete</p><p></p><p>Some of the iron stained pits in that rock look as if it was calcite rather than pyrite and there looked to be a few little triangular pits weathered out. They may have been arsenopyrite also a reasonable indicator of gold but not always. One speck is not a lot but in mining terms that may well be ore grade. we used to work on the old timer's rule of thumb that if you can see a speck of gold in a rock then the overall grade of the sample would be near enough to one ounce of gold per tonne.</p><p></p><p>If when you crush a sample and it smell like roasted or bitter almonds then the sulphide in the rock is arsenopyrite - don't sniff it too deeply because arsenopyrite, as the name suggests, is an arsenic-iron sulphide.</p><p></p><p>Araluen</p></blockquote><p></p>
[QUOTE="SWright, post: 115666, member: 1541"] G'day ProspectorPete Some of the iron stained pits in that rock look as if it was calcite rather than pyrite and there looked to be a few little triangular pits weathered out. They may have been arsenopyrite also a reasonable indicator of gold but not always. One speck is not a lot but in mining terms that may well be ore grade. we used to work on the old timer's rule of thumb that if you can see a speck of gold in a rock then the overall grade of the sample would be near enough to one ounce of gold per tonne. If when you crush a sample and it smell like roasted or bitter almonds then the sulphide in the rock is arsenopyrite - don't sniff it too deeply because arsenopyrite, as the name suggests, is an arsenic-iron sulphide. Araluen [/QUOTE]
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Gold Prospecting
Hard Rock Gold Prospecting
Home sampling finally started
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