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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.
Additional articles that might interest you...
Pickers and Nuggets
September 2016
Mike and I each selected a side of the creek and started to work our way upstream. We both worked the water and sides of the creek, and better than half the gold found in this area is in the water.
Mike and I each selected a side of the creek and started to work our way upstream. We both worked the water and sides of the creek, and better than half the gold found in this area is in the water.
The Manson Mine
November 2001
The Manson Mine. That’s what they called it in Ballarat in 1969. The name stuck even after Crazy Charlie Manson and the girls got hauled out of California’s Panamint Range behind Ballarat in handcuffs and ended up in prison for the Tate-LaBianca murders.
The Manson Mine. That’s what they called it in Ballarat in 1969. The name stuck even after Crazy Charlie Manson and the girls got hauled out of California’s Panamint Range behind Ballarat in handcuffs and ended up in prison for the Tate-LaBianca murders.
Minnesota Delays Decision on Mineral Leases
November 2011
Landowners complained that mineral mining on or near their property could damage property values while leaving them without a cut of potential profits.
Landowners complained that mineral mining on or near their property could damage property values while leaving them without a cut of potential profits.
"I Got Dusted"
October 2008
Out of the blue Archie mentioned, "I was dusted." My dad misunderstood and thought Archie had developed silicosis, then known and feared as "miners lung."
Out of the blue Archie mentioned, "I was dusted." My dad misunderstood and thought Archie had developed silicosis, then known and feared as "miners lung."
Sydney Resource Corp. Ventures into Canada and Mexico
July 2006
The Northern Ontario city of Timmins is famous for many things including the fact that the Timmins Mining Camp has been among the most prolific gold mining areas in the world with total historic production of near seventy million ounces since...
The Northern Ontario city of Timmins is famous for many things including the fact that the Timmins Mining Camp has been among the most prolific gold mining areas in the world with total historic production of near seventy million ounces since...
Melman on Gold & Silver
October 2013
I believe gold and silver prices, to at least some extent, negatively mirror the society's confidence in the ability of government to continue providing economic and social services.
I believe gold and silver prices, to at least some extent, negatively mirror the society's confidence in the ability of government to continue providing economic and social services.
An Alaskan in the Lower 48
July 2013
Our destination was some old hydraulic workings where the old miners had washed literally mountains of material away to expose gold in ancient river channels.
Our destination was some old hydraulic workings where the old miners had washed literally mountains of material away to expose gold in ancient river channels.
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