Mineralized Calderas in Colorado
May 2002 by Edgar B. Heylmun, PhDA 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.
• Prospecting for Diamonds in Kimberlite by W. Dan Hausel
• Miners referring to their activity as “recreational”
• There's a fungus among us
• Taxpayers crash land in Arizona
• "What did you get arrested for?"
In our April and May 2001 issues we reported on the administrative hearings involving the 16-to-1 Mine and their fight against countless MSHA citations, many of which seemed to be driven by inspectors following their own agenda.
Q: Can you tell me if this deposit is worth working? It is a quartz vein and I had it analyzed for gold, copper, rare earths and other metals.
True independence is rare among prospectors and miners. There is always someone or some agency that is telling the small-scale miner or prospector how to operate or requiring changes in their operations.
In this article, part of an ongoing series taking a look at critical metals in our economy, we will examine the mining and use of the metal zinc.
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