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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.
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Lightning Creek, British Columbia
September 2000
Lightning Creek is one of the famous placer gold streams in the Cariboo district of east-central British Columbia, Canada. It is 445 miles, by highway, north of Vancouver, some 50 miles east of the town of Quesnel (pop. 8,500).
Lightning Creek is one of the famous placer gold streams in the Cariboo district of east-central British Columbia, Canada. It is 445 miles, by highway, north of Vancouver, some 50 miles east of the town of Quesnel (pop. 8,500).
Ask The Experts
January 2016
Viewing details on Google Earth
Viewing details on Google Earth
The Basics of Froth Flotation
June 2015
I thought it might be worthwhile to take a look at the basics of this important mineral separation technique and how a miner can use it to recover the values out of an ore.
I thought it might be worthwhile to take a look at the basics of this important mineral separation technique and how a miner can use it to recover the values out of an ore.
Legislative and Regulatory Update
January 2003
• The ESA used, and apparently abused, in Arizona and New Mexico
• In a somewhat related story...
• Among the numerous bills that died when Congress adjourned...
• More on the ESA
• Miners must present proof of filing, says IBLA
• Federal government backs mining project
• Appeals Court says Clinton roadless rule can stay
• The ESA used, and apparently abused, in Arizona and New Mexico
• In a somewhat related story...
• Among the numerous bills that died when Congress adjourned...
• More on the ESA
• Miners must present proof of filing, says IBLA
• Federal government backs mining project
• Appeals Court says Clinton roadless rule can stay
Legislative and Regulatory Update
June 2000
• Forest Service Oversteps Authority, Former Official Says
• Glamis Gold Ltd. Files Suit to Vacate Solicitor's Opinion
• Babbitt Targets White Vulcan Mine and San Francisco Peaks in Arizona
• Forest Service Oversteps Authority, Former Official Says
• Glamis Gold Ltd. Files Suit to Vacate Solicitor's Opinion
• Babbitt Targets White Vulcan Mine and San Francisco Peaks in Arizona
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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
