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History & Geology

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Sulfides and oxides—what's the difference between the two?

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Reno's 1872 Time Capsule Includes Gold Rush Lore


The Reno Masonic Lodge was built along the railroad tracks back when Ulysses S. Grant was president and shortly after the Comstock Lode of gold and silver was struck in Virginia City.

Eastern Arizona: Gold and Base Metal Deposits Part II


In this review of precious and base metal deposits in Arizona, it is apparent that several significant mines and mineral deposits occur in eastern Arizona, and there is considerable potential for new discoveries.

$50 Million in Gold From 1857 Shipwreck Approved for Sale


The gold is all for sale. Just one tiny coin alone could go for $1 million because of its combination of rarity and the history behind it...

California: The Land of Big Nuggets—Part II


There are a number of Tertiary river channels in the area, most of which trend south-southwest. They tend to be steep, narrow, and rich with coarse gold.

One Question, Forever Unanswered—Did He Really Find the Gold?


This was one of those stories where you have no doubt that the person telling it believes it to be true. But was it?

Sulfides and Intergrain Gold Wire Nuggets


...these nuggets have not traveled far from the lode because the golden wire lattices would have been torn apart or flattened during weathering of rock and deposition by violent stream action.

Copper Deposits of Alaska


Only the famous Kennecott copper mine was able to continue operating through the Depression owing to the exceptional richness of its ore.

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