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Mineralized Calderas in Colorado

A caldera is a large circular volcanic depression caused by collapse due to the removal of molten magma from an underlying magma chamber. The removal of magma is due to explosive venting of lava and pyroclastic material.

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Ask the Experts: Something for everyone...


Q: Can you suggest some family and dog friendly vacation spots in California where I can also do some sniping?

Picks & Pans: Confessions of a Professional Nuggetshooter


Howdy, fellow nuggetshooters! My name is Lunk, formerly known as Crummy, a professional nuggetshooter with a few tips for you weekenders who are thinking about going pro.

Legislative and Regulatory Update


Every prospector and claim holder should be aware of the court decision USA  v. Shumway (96-16480) from the U.S. 9th Circuit Court of Appeals filed December 28, 1999.

Oregon's Measure 7 May Provide Compensation for Land-Use Restrictions


Opponents of Measure 7 warn that it will grow into a monster.

Mining Districts in Montana Get Organized


Those miners present immediately recognized the benefits of becoming members of MMAC and joined up on the spot. I spent some time answering a few questions, and then the miners took over.

Sampling for Success—Part II


The first and most important thing of the sampling process is to try to be as unbiased as possible. There is a natural tendency to select rock that looks the best—even unconsciously.

Gold & Silver of the Comstock Lode


There still remains some material in place along the lode that could be mined at high gold and silver prices.

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The Bawl Mill   • Our Readers Say   • California Wilderness Coalition and The Nature Conservancy Recruit Government Employees to Carry Out Huge Land Grab   • Drywashing Rules Clarified   • The Keystone Gold-Copper District, Medicine Bow Mountains, Southeastern Wyoming   • Picks & Pans: Mining Tungsten Ore—A Case History   • Gold in Oregon   • Aussie Gold—A Look at the Northern Territory   • The Phoenix Gold Mine: A Brief History   • Calico Mine   • Mining Stock Quotes and Mineral & Metal Prices   • Looking Back   • Melman on Gold & Silver

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