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Mineralized Calderas in Colorado
May 2002 by Edgar B. Heylmun, PhD
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.
Who is a Qualified Person?
So you think you have an ore deposit? The work has been long and hard, but there are a few drill holes, lots of samples and assays. The data is in a reliable computer and there may be a mine at the end of the tunnel. What is the likelihood of a profitable operation? Can you raise capital for development or exploration?
Give That Club Claim A Chance
My first trip to the claim was the tip-off that there might be larger gold to be found. I brought my puffer drywasher and my dad to a local prospecting club outing that was held at the claim.Mining Stock Quotes and Mineral & Metal Prices
PLP Update
We’ve heard from miners in Arizona about federal agencies closing off historic roads that provide access for miners, and we need your input.
Effectively Using a Detector and Drywasher for Placer Gold
A "How-To" method for small group sniping and reclaiming old placer areas.
Mining Stock Quotes and Mineral & Metal Prices
The Bawl Mill
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• 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
