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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.
Legislative and Regulatory Update
- Some mining claim fees increase
- Oregon miners file appeal
- US Fish & Wildlife law enforcement policing powers restrained
Ask the Experts
Centrifugal bowls versus jigs
Money In, Money Out
With conventional financing still difficult to obtain, it is little wonder that “self-financing” is the number one form of financing used by small business owners, miners and prospectors.
The French Mines of El Boleo
Volumes have been written on the subject of mining in Mexico ever since the first Spanish conquistadors undertook to strip bare the newfound land in the 6th century. Gold and silver, which attracted Cortez and the Spanish Inquisition, was there for the taking, and the fabulously rich mines of Guanajuanto, San Miguel de Allende, Zacatecas, Real del Monte, San Luis Potosi, Durango and Taxco, among others, became famous throughout the New World and Europe.
Our Readers Say
- Conversion charts and tables
- Solutions to anti-mining efforts
Because I Said So
Like all federal judges, he swore an oath to perform his duties “impartially… under the Constitution and laws of the U.S.” Nothing in those documents gives Judge Morris authority to order the BLM to work with non-government organizations (the same ones that filed the lawsuit in question) to alter America’s use of energy.
MMAC & PLP Update -- Rand Mining District Gets Organized
The process of updating the Rand Mining District is underway and you’ll see a Public Notice in this issue requesting interested parties to submit an application to serve on the board.
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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
