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History & Geology

Gold Deposition and Gradients of Placer Streams—Part I

When placer miners from the gold rush era began experimenting with the slope of their sluices, they must have pondered the ideal slope for trapping gold in a creek bed too. Logic suggests the same is true for streams...

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Additional articles that might interest you...

Gold of the Iditarod Mining District, Alaska


It was the middle of winter and the valley was covered in snow, making prospecting a matter of sinking shafts in the ground.

All About Quartz—Part II


In our May 2013 issue, we took a look at the mineral quartz, a mineral very commonly associated with gold. However, gold is not the only reason prospectors are interested in quartz. Quartz can also be very valuable as a gemstone

Gold of Plumas County


Plumas County has a rich heritage of gold mining, much of it from placer deposits that can still be searched and panned today. Being at the far northern end of California’s famed Mother Lode, it is quite often overlooked by those searching for gold today—really a well-kept secret after all of these years!

Testing Ores for Free Gold


I get a number of questions from people about testing and treating hard rock ores. The simplest way, but also an expensive one, is to just have an assay test done by an independent assay firm. As an alternative...

Associated Gold Placers of the Comstock


What many people don’t realize is that the Comstock Lode produced over 8,000,000 ounces of gold…

Eastern Arizona: Gold and Base Metal Deposits—Part I


Arizona is well-known for its copper-gold porphyries and massive base metal-gold sulfide deposits such that primary gold deposits in the state are often overshadowed.

Enrichment of Mineral Deposits by Weathering—Part I


The exact minerals formed in the concentrated supergene deposits depends much on the type of country rock around the deposit and the chemistry of the deposit itself, but if conditions are right, this process will form some rich patches of bonanza ore, in some places valued at thousands of dollars to the ton.

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