History & Geology
Gold Deposition and Gradients of Placer Streams—Part I
June 2012 by Jim Halloran

Prospecting for Surface Flood Gold Placers on Low and Intermediate Gradient Streams

Gold: Is It Everywhere?
Gold, on the other hand, is super rare, and is one of the rarest elements in the earth’s crust. It averages only 0.000004 percent of the earth’s surface. That is four parts in a billion.
The Heavy Minerals in Your Concentrates

Electrum: Gold and Silver Together

Gold and Silver Deposits of Bodie, California
Bodie, California, in its heyday, was once rumored to be one of the roughest and most lawless towns in the American West.
Copper Deposits of Alaska

The Mineral Range Districts of Utah
Most of the commercial mineral deposits are on the south and southwest part of the range between Minersville and Milford, though small amounts of gold and silver have also been found in iron-rich outcrops in the basalt to the south of Milford.
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