All Articles
American Manganese
May 2010 by Chris Ralph
Exploration geologists looking for strategic metals projects may find open ground in some of the old historic manganese mine areas as manganese has been largely overlooked as an exploration target for many decades.
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Ask the Experts
April 2012
Q: Can a voltmeter be used to determine the type of metal/mineral present in soil?
Q: Can a voltmeter be used to determine the type of metal/mineral present in soil?
Looking Back
July 2007
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
Which Specific Gravity Test Works Best?
August 2011
Have you ever wondered how accurate specific gravity tests are in determining the amount of gold in a specimen?
Have you ever wondered how accurate specific gravity tests are in determining the amount of gold in a specimen?
Lluvia de Oro—A Shower of Gold Awaiting Development in the Sierra Madre—Part II
December 2008
Superintendent Tom Phillips soon returned to the mines with fellow worker Thomas J. Findlay, and began repair work. Phillips had already determined that the machinery had been operated at various times by armed forces...
Superintendent Tom Phillips soon returned to the mines with fellow worker Thomas J. Findlay, and began repair work. Phillips had already determined that the machinery had been operated at various times by armed forces...
Placer Gemstones
December 2001
Only the so-called “precious gems” will be considered in this article. They are diamond, ruby, sapphire, and emerald. A “gem” must be rare, hard, and durable, and possess a unique color or quality in order to be classified as a gem.
Only the so-called “precious gems” will be considered in this article. They are diamond, ruby, sapphire, and emerald. A “gem” must be rare, hard, and durable, and possess a unique color or quality in order to be classified as a gem.
Northern Gold Mining's Garrison Gold Property
July 2011
During our visit during late May, 2011, the vertical nature of the mineralized areas was clearly visible, as were numerous examples of quartz-carbonate veins in shear zones, faults and folds.
During our visit during late May, 2011, the vertical nature of the mineralized areas was clearly visible, as were numerous examples of quartz-carbonate veins in shear zones, faults and folds.
Looking Back
March 2002
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
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