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History & Geology

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

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Natural Gold Alloys


Natural gold is never 100% pure; all natural nuggets contain at least some impurities. We're going to take a look at just what some of those impurities might be.

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.

Iron Ores and Iron Mining


For more than 40 years, iron ore prices have been decided by private negotiations conducted between the largest of the iron miners and the largest steel producers. These two sides dominate both the spot and contract iron ore markets.

The Struggle to Reopen Alaska's Largest Gold Mine


The historical AJ mine, located east of Juneau, Alaska, was considered the largest gold mine in the state at one time. Joe Juneau and Richard Harris struck gold there in 1880, and it has been more recently known as a tourist destination.

Gold Deposits of the Ivory Coast


Ivory Coast has considerable gold reserves, and this nation has the largest area of greenstone belts prospective for gold in the continent.

Exploring and Mining for Uranium


For a time uranium was more popular with prospectors than gold, but this is no longer true, and it has been decades since it was common to see individuals armed with Geiger counters out in the field.

Gold in The Silver Crown District, Wyoming


When my field assistant Jay Roberts and I entered the mine, it appeared as if someone just walked out of the mine, turned off the lights and never returned.

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