All Articles
The Trapiches of Chile
October 2000 by Dr. Ralph E. Pray
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.Additional articles that might interest you...
Ask The Experts—Using classifiers
December 2010
Q: I would like to know how to use a classifier when I dump my gravel into my sluice box. I would also like to know what sizes classifiers come in. I know that they are in sizes like -3/4. What does the “minus” in the size mean? Thanks for any help you can give me.
Q: I would like to know how to use a classifier when I dump my gravel into my sluice box. I would also like to know what sizes classifiers come in. I know that they are in sizes like -3/4. What does the “minus” in the size mean? Thanks for any help you can give me.
Eastern Arizona: Gold and Base Metal Deposits Part II
March 2011
In this review of precious and base metal deposits in Arizona, it is apparent that several significant mines and mineral deposits occur in eastern Arizona, and there is considerable potential for new discoveries.
In this review of precious and base metal deposits in Arizona, it is apparent that several significant mines and mineral deposits occur in eastern Arizona, and there is considerable potential for new discoveries.
Silverton Preserving Lofty Symbol of Mining Era
December 1999
Now, the Old Hundred-Mine boarding house has a new lease on life thanks to a town where some cling to the relics of a vanquished mining industry...
Now, the Old Hundred-Mine boarding house has a new lease on life thanks to a town where some cling to the relics of a vanquished mining industry...
From Vietnam to Wedding Bands
February 2017
It’s a common symptom of gold fever for miners to be very hesitant to let go of gold they’ve found or even have it made into jewelry. I confess, I suffer from the same incurable disease!
It’s a common symptom of gold fever for miners to be very hesitant to let go of gold they’ve found or even have it made into jewelry. I confess, I suffer from the same incurable disease!
The Bawl Mill
October 2006
• Who was that unmasked man?
• Run for the border...
• Finally, a bill worth passing!
• Who was that unmasked man?
• Run for the border...
• Finally, a bill worth passing!
Michigan Proposal Would Restrict Mining Operations
November 2009
A group called Michigan Save Our Water Committee is seeking a Michigan ballot measure that would prohibit some types of mining and restrict others.
A group called Michigan Save Our Water Committee is seeking a Michigan ballot measure that would prohibit some types of mining and restrict others.
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The Bawl Mill
• A Word from the Editor
• Under the Guise of Environmental Protection—EPA Revealed
• The Centennial Lode and the Centennial Ridge District, Wyoming
• Company Notes
• Picks & Pans—In Search of Nome Creek Gold
• Massive Sulfide Deposits in Oregon
• Recreational Dredging on the South Yuba River
• Tales of Liberty Gold
• Drywashing Alluvial Placers
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
