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Gold Prospecting
Metal Detecting for Gold
Mineralisation Identification
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<blockquote data-quote="PhaseTech" data-source="post: 350115" data-attributes="member: 3149"><p>Where you are pinging ground noise with the SDC - that is hot ground! </p><p></p><p>But yes, BigWave pretty much nailed it. Ground goes red because iron is oxidised. </p><p>Wikipedia says: "<em>Yellow or red soil indicates the presence of oxidized ferric iron oxides. Dark brown or black color in soil indicates that the soil has a high organic matter content. Wet soil will appear darker than dry soil. However, the presence of water also affects soil color by affecting the oxidation rate.</em>"</p><p></p><p>So, blood red soils, with a healthy dose of visible ironstone on the surface you can be sure it'll be pretty mineralised. But there are other things that can make your detector go pear shaped like basalt, in seemingly non mineralised soils. The one time I was in Arizona I was working a creek and the colour of the dirt was quite pale, and looked pretty tame, but running a magnet through the wash indicated huge amounts of black sand! </p><p></p><p>The visual clues will give you a fair indication, but ultimately when you start swinging your detector, that will tell you the true nature of the ground.</p></blockquote><p></p>
[QUOTE="PhaseTech, post: 350115, member: 3149"] Where you are pinging ground noise with the SDC - that is hot ground! But yes, BigWave pretty much nailed it. Ground goes red because iron is oxidised. Wikipedia says: "[i]Yellow or red soil indicates the presence of oxidized ferric iron oxides. Dark brown or black color in soil indicates that the soil has a high organic matter content. Wet soil will appear darker than dry soil. However, the presence of water also affects soil color by affecting the oxidation rate.[/i]" So, blood red soils, with a healthy dose of visible ironstone on the surface you can be sure it'll be pretty mineralised. But there are other things that can make your detector go pear shaped like basalt, in seemingly non mineralised soils. The one time I was in Arizona I was working a creek and the colour of the dirt was quite pale, and looked pretty tame, but running a magnet through the wash indicated huge amounts of black sand! The visual clues will give you a fair indication, but ultimately when you start swinging your detector, that will tell you the true nature of the ground. [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
Mineralisation Identification
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