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History & Geology

Eastern Arizona: Gold and Base Metal Deposits—Part I

Arizona is well-known for its copper-gold porphyries and massive base metal-gold sulfide deposits such that primary gold deposits in the state are often overshadowed.

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Butte, Montana—The Richest Hill on Earth


I recently had the opportunity to spend a day exploring around Butte, Montana and was amazed by the amount of mining that has taken place there. The old-timers called Butte “the richest hill on earth” and had pretty good reasons for doing so.

The Oquirrh Mountains, Utah


...we will visit three dormant mining districts that lie in the Oquirrh Range in Utah. Some major activity that transformed the lives of thousands of people occurred here from the mid 1860s to the late 1990s.

Glaciers and Placer Gold Deposits


It also happens sometimes that glaciers will bury valuable placer deposits. This occurs when the glacier goes over the top of an existing placer deposit.

Prospecting for Surface Flood Gold Placers on Low and Intermediate Gradient Streams


Sample panning is a very important method used to find the richest parts of a flood gold deposit before setting up equipment and running material.

Preserving the True History of the Ivanhoe


My partner had the contacts and it wasn’t long before we had an agreement in place and the company had a geologist on site. I recall a time when he was getting the lay of the land, so to speak, and he broke off a rock sample and inspected it with his magnifier.

The Bawl Mill


• Do as I say, not as I do...
• By the numbers...

Montana’s Rosetta Stone: Discovering Mines In The Treasure State


This is the intelligent way to start modern prospecting. The value of literary research yields challenging outings, specimens, history and geologic research.

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The Bawl Mill   • Our Readers Say   • The Basics of Crushing and Milling Operations   • Ask The Experts—What minerals are magnetic? Can rare earth magnets capture platinum?   • Ask The Experts—Jet nozzle or suction nozzle? Which is best for my highbanker?   • Ask The Experts—Precious metals in water?   • Rediscovering Placerville, California   • Over The Divide—Daryl J. Nelson   • Legislative and Regulatory Update   • Cyanide-Free Gold Separation   • Mining Stock Quotes & Mineral and Metal Prices   • Melman on Gold & Silver

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Mud Men: Pocket Miners of Southwest Oregon—Part I

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