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Platinum in Laccoliths

Laccoliths are unusual igneous features that seem to occur in the stable interior parts of continents. They are concordant igneous intrusions that have domed the overlying rocks and are circular in plan, and less than 10 miles in diameter. This article deals with some of the laccoliths found in the scenic Colorado Plateau province of Utah, Colorado, and Arizona...

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The Golden Highway—Placer County


Leaving El Dorado County and crossing the middle fork of the American River, the next county along Highway 49, the “Golden Highway,” is Placer County. The county also owes its name to the mining heritage of the gold rush.

The Ocampo District, Chihuahua


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Melman on Gold & Silver


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The Bawl Mill


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MMAC & PLP Update


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Placer Gold in the Black Hills, South Dakota


During the Indian Wars in 1874, General George Custer and his men camped on French Creek in the southern Black Hills, near the present site of Custer, South Dakota. Two of his men found placer gold in French Creek. Word got out, and before long, a party of prospectors arrived. However, the government had signed a treaty with the Sioux Indians to stay out of the Black Hills. This led to prospectors sneaking in and working creeks all over the region at their own risk.

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