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Prospecting for Silver With a Geiger Counter
January 2001 by Edgar B. Heylmun, PhD
Light-colored volcanic tuff or tuffaceous sandstone often contains small amounts of uranium, enough to be detected with a sensitive radiation detector. Sometimes, the mass effect of the radiation is substantial.Looking Back
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
Lluvia de Oro— A Shower of Gold Awaiting Development in the Sierra Madre—Part I
In the silver belt of the Sierra Madre, the Lluvia de Oro was a discovery of gold, found not by the Spaniards of yore, but from an observant Indian a little over a century ago.
Who Jumped Whose Claim First?
At this point, stress raised my blood pressure and I was figuring out escape routes through the brush, but thought it best to continue the conversation.
And the Survey Says...
A recent online survey on our homepage confirmed what we expected...
Buell Park Pipe, Arizona
One of the world’s largest kimberlite pipes is located on the Navajo Indian Reservation in northern Arizona. The pipe is larger than any diamond-bearing pipe in South Africa. It is 16 miles north of Window Rock, the capital of the Navajo Nation.
Picks & Pans: Fig Tree, Grape Vine and Good Gold
The south fork of the Yuba River was still too high to cross safely on the first day of the dredging season for 2002, but Leon was able to use this condition to his advantage. He dredged high on the bank where big dredges would not go and produced...
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