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Paleoplacers in the Black Hills

The Black Hills of western South Dakota are domal mountains that rise to 7,242 feet near Mt. Rushmore National Monument. Annual precipitation reaches 28 inches, enough to support winter sports and pine forests.

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Ask the Experts


Bismuth oxide for assaying?

Lithium Fuels Hopes Around Salton Sea


The lake is at the southern tip of the San Andreas Fault, which has shifting tectonic plates that bring molten material closer to Earth’s surface. The only other part of the US known to have more geothermal brine available is on the fault’s other end in Northern California.

Odd People and Other Desert Animals


Circulation and Collections Manager Leaving ICMJ


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Mining Stock Quotes, Mineral & Metal Prices


Company Notes


• U.S. Gold Corporation
• AZCO Mining Co.
• Canyon Resources Corporation
• Placer Dome, Inc.
• Vista Gold Corp.
• Grupo Mexico

The Challenge of Winter Dredging


Dredges actually do pretty well in freezing conditions. There are a few tips you should know, however.

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