History & Geology
Alluvial Paystreaks
November 2018 by Matteo Oberto
The gravels in contact with the bedrock or false bedrock base are often the richest. The same facts apply to the alluvial paystreaks that are formed on gravel bars; the lowest level of the gold-bearing gravel is normally the richest.
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Everyone has heard of the golden beach at Nome, but Nome did not have the richest beach.
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The interesting thing about the Mother Lode area is that we can pretty much find at least a little gold in any creek or river (and even in some of the many dry gulches).
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We import nearly all of our REEs from China, so it’s critical that we find and continue to develop domestic resources of these elements.
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There are both hard rock and beach sand types of titanium deposits, but the hard rock deposits need to be at least 10 percent titanium while the beach sands often are economic with only two or three percent titanium.
Ask The Experts
Q: Is there a correlation between fault zones and mineralization of economic metals?
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Confluences of placer streams are well known as concentration sites for heavy minerals. The basic reason is that...
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Common thought is the switchback slows the velocity of the rushing water and gold drops out from the cut bank to a fill gravel bar within or below the switchback. I am not going to disregard that model; however, I hope to improve upon it.
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