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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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Looking Back


Excerpts from California Mining Journal, our original title, published 50 years ago this month.

Looking Back


Excerpts from California Mining Journal, our original title, published 50 years ago this month.

The Trapiches of Chile


In Chile, the trapiche (tra-peach-ee) method of milling gold ore began more than 400 years ago. The first trapiche, also known as a Chilean mill, was a stone wheel weighing two or three tons rotating on an axle.

Just Feel The Heft of It


“Just feel the heft of it!” Those were the words that lit the fire that created a prospector. Before I tell you what took place, I have a desire to tell you when and where it took place.

Colorado Uranium Mining in the 1950s Boom


You can learn a lot from a small mining operation because you have to become proficient in every job. Soon I was preparing fuses, placing powder (dynamite) and learning the ins and outs of drilling and blasting.

Legislative and Regulatory Update


  • New Deputy Secretary of Interior
  • Case against dredger allowed to proceed

PLP Update


We are happy to report that the current administration has issued a directive to the Forest Service and BLM to address this concern…

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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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Legislative and Regulatory Update

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