History & Geology
Strategic Metals—Part II
December 2013 by Bill Rich
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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How Mesothermal/Orogenic Gold Deposits Form
These deposits are very widespread across the planet. In fact, they are so extensive that something around 75% of all the gold ever mined comes from these types of deposits (if one includes the placer deposits that also formed from them).
The Many Facets of Iron
I’ve been fascinated by iron minerals for many years. So let’s take a look at this very interesting and colorful element.
Ask The Experts
Sulfides and oxides—what's the difference between the two?
ICMJ Visits Sonora, CA
June 2023Alluvial Paystreaks
The gravels in contact with the bedrock or false bedrock base are often the richest. The same facts apply to the alluvial paystreaks that are formed on gravel bars; the lowest level of the gold-bearing gravel is normally the richest.
ICMJ Visits Downieville, California
January 2023
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The Bawl Mill
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• Sierra County Gold—Part I
• ICMJ's Annual Index
• Ophir—Possibly the Best Kept Secret in Alaska—Part II
• Hunting for Hardrock: The Basics
• Gold in the San Francisco District Oatman, Mohave County, Arizona
• Heavy Glacial Rocks and Gold in the Midwest
• The Amazing Mineral Tourmaline
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
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