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History & Geology

Strategic Metals—Part II

There are literally thousands of abandoned wasterock and ore dumps that dot the United States that could hold many tones of strategic metals.

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The Tombstone Silver-Lead District, Arizona


In 1877, a prospector named Ed Schieffelin discovered silver in “the middle of nowhere” and staked two claims: “Tumbstone” and “Graveyard.” Soon a town and mining district were organized and acquired the name “Tombstone” after making a spelling correction.

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Gold, Quartz & Chalcedony—Part II


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Ask The Experts


Q: Is there a correlation between fault zones and mineralization of economic metals?

Benches and Fossil Placers


Unfortunately for us mortal humans, we have a poor perspective on geologic time. When we look at a landscape such as a stream valley, we see it only in two, or at the most, three dimensions. We have poor comprehension of the valley’s fourth and most important dimension—time.

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