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History & Geology

The Wild Rush to Find More Cobalt—Part I

While some future cobalt will come from recycling lithium batteries and other products, the coming huge need for cobalt is virtually a perfect storm of heavy demand and insufficient supply.

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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.

The Paragenesis of Gold & Silver Deposits


…if you are game for digging in and learning more about the intricate details of how gold deposits form, then let’s jump right in.

Prospecting With The Help of Fluvial Geomorphology


Quiz yourself about the stream in figure 5. Based on your previous knowledge of where gold is found in a stream and in this article, where do you think you will find the most gold?

What Are Those Rocks In My Pan?


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Flood Plain Gold Deposits—What Are They Really?


We just completed a trip to another river, and yes, there was definite movement and redistribution of gravels, and other prospectors have seen this as well.

Rock and Formations of the Mother Lode Gold Belt


The faulting, folding and shearing that occurred in the Mother Lode belt has created zones of structurally weak rocks or contacts between different types of rock, which has been favorable for the deposition of gold bearing ores.

How Mesothermal/Orogenic Gold Deposits Form


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