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History & Geology

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Geology and stories from the past

ICMJ Visits Downieville, California


ICMJ Visits Colfax, California


ICMJ Visits Virginia City, Nevada


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Home of the Original Gold Claimer

Connecting With The Past With Gold Rush Coins


Formation of Gold Deposits in the South Eastern United States


ICMJ Visits the Ghost Town of Bodie, California


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ICMJ Visits Sonora, CA


The Rich Mining History of Two Mother-Load Towns


ICMJ Visits Grass Valley, California


March 2023

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Quartz: The Indicator of Gold


Quartz: The Indicator of Gold

The Forms of Crystalline Gold


The largest and most perfect single gold crystals are nearly always in the form of octahedra. These large octahedral crystals often possess deeply recessed faces.

The History of Mining Claims


Congress decided that if they shared the riches of our lands with the people, we would colonize and expand the states at a much faster pace, thus the birth of public lands and mining claims in America.

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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.

Blast from the Past: Jeff Casserly Tells His Own Story


I have been finding nuggets all my life, beginning in Sierra County 50 years ago, and believe me they don’t pop up out of the ground like mushrooms when they see me coming and say, “Here I am and take me home.”

Crystallized Gold Mines of California


Gold specimens that include visible crystal formations are among the rarest, most attractive and most valuable forms of gold to be found.

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How Far Has That Gold Traveled?


Let’s examine why your placer gold looks the way it does and what you can tell about its journey based upon its appearance.

Why Is The Gold On Bedrock—Or Why Is It Not?


Gold on the bedrock is a good rule of thumb, but not one that is 100 percent effective. There are plenty of exceptions. So, how does a prospector recognize those exceptions?

Historic Dredge Uncovered in North Carolina


The Robinson is a wooden bucket-line dredge that was built in the early 1900s in New York and shipped in pieces to Nash County in North Carolina by train for reassembly.

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Residual Placers: An Often Overlooked Gold Source


Because the forces of erosion and gravity tend to carry lighter materials like quartz away more easily, the heavy minerals like gold or silver will tend to be concentrated in the general area around the vein outcrop. These concentrations are what make residual placers so attractive.

A Short History of Hydraulic Mining in California


To add to the confusion, the dam wasn’t holding back a large amount of water. It was full of gravels and had a small creek running through it. I had to know more.

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