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...
Great Panther Silver
January 2011
The company acquired the Guanajuato Mine Complex in 2005, and since that time they have carried out extensive drilling programs, both from surface and underground, with particular emphasis being placed on the Cata Clavo Zone.
The company acquired the Guanajuato Mine Complex in 2005, and since that time they have carried out extensive drilling programs, both from surface and underground, with particular emphasis being placed on the Cata Clavo Zone.
Guest Editorial—Globalizing Mining in America, Part II
September 2000
Defeating the Biodiversity Treaty
Defeating the Biodiversity Treaty
Placer Testing with Large Samples
June 2000
Of all the difficult gold placer sites to evaluate, none can compare with trying to dig to bedrock through twenty or thirty feet of soaked overburden through which water is slowly seeping downgrade.
Of all the difficult gold placer sites to evaluate, none can compare with trying to dig to bedrock through twenty or thirty feet of soaked overburden through which water is slowly seeping downgrade.
Detecting Nuggets—Overcoming New Challenges
September 2015
Depth is not an issue unless the site is thoroughly cleaned of shallow trash, and it is far easier to isolate and remove targets using a small coil in a target rich location.
Depth is not an issue unless the site is thoroughly cleaned of shallow trash, and it is far easier to isolate and remove targets using a small coil in a target rich location.
The Madonna Nugget
October 2013
It was down deeper than I expected for surface trash. It wasn't until I was down six inches that the target screamed from my scoop.
It was down deeper than I expected for surface trash. It wasn't until I was down six inches that the target screamed from my scoop.
Melman on Gold & Silver
August 2015
Next, all of silver’s chart action since mid-2011 has taken place under a declining trend line (dotted line), which has held for more than four years. Any trendline of that duration must be taken seriously.
Next, all of silver’s chart action since mid-2011 has taken place under a declining trend line (dotted line), which has held for more than four years. Any trendline of that duration must be taken seriously.
Gold Depositiion and Gradients of Placer Streams—Part II
July 2012
The steeper the gradient is, the more potential erosive power to move gold and other bedload sediments, and the more power to remove obstacles to flow.
The steeper the gradient is, the more potential erosive power to move gold and other bedload sediments, and the more power to remove obstacles to flow.
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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
