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Gold Prospecting
Alluvial Gold Prospecting
The travel of Alluvial goldl
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<blockquote data-quote="user 4386" data-source="post: 488234" data-attributes="member: 4386"><p>Here is a map that shows how the fine gold travels until a drop in stream velocity dumps it out:</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/4386/1557280022_beechworth_placer.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The gold originates in the reefs around Beechworth and gets carried into the stream to the north on the Mt Pilot Batholith, then westward to Eldorado where it has been extensively mined as a deep lead and dredged at shallow depth. The Mt Pilot Batholith is a granite and contains no gold veins at all, so all the gold at Eldorado (and in the Woolshed etc along the way but mostly closer to Beechworth) is derived from south of the granite at Beechworth, 26 km upstream. The reason the last of the gold dumped out at Eldorado is that the stream ran west off the granite into the metamorphic (originally sedimentary) rocks cooked up by the granite on its western margin. This hard rock dammed the stream a bit and caused it to slow, dropping the fine gold out of suspension at Eldorado.</p></blockquote><p></p>
[QUOTE="user 4386, post: 488234, member: 4386"] Here is a map that shows how the fine gold travels until a drop in stream velocity dumps it out: [img]https://www.prospectingaustralia.com/forum/img/member-images/4386/1557280022_beechworth_placer.jpg[/img] The gold originates in the reefs around Beechworth and gets carried into the stream to the north on the Mt Pilot Batholith, then westward to Eldorado where it has been extensively mined as a deep lead and dredged at shallow depth. The Mt Pilot Batholith is a granite and contains no gold veins at all, so all the gold at Eldorado (and in the Woolshed etc along the way but mostly closer to Beechworth) is derived from south of the granite at Beechworth, 26 km upstream. The reason the last of the gold dumped out at Eldorado is that the stream ran west off the granite into the metamorphic (originally sedimentary) rocks cooked up by the granite on its western margin. This hard rock dammed the stream a bit and caused it to slow, dropping the fine gold out of suspension at Eldorado. [/QUOTE]
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Gold Prospecting
Alluvial Gold Prospecting
The travel of Alluvial goldl
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