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Platinum in Laccoliths
May 2003 by Edgar B. Heylmun, PhD
Laccoliths are unusual igneous features that seem to occur in the stable interior parts of continents. They are concordant igneous intrusions that have domed the overlying rocks and are circular in plan, and less than 10 miles in diameter. This article deals with some of the laccoliths found in the scenic Colorado Plateau province of Utah, Colorado, and Arizona...Additional articles that might interest you...
Looking Back
May 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.
The Snapshot
November 2015
Once all the numbers from all the samples and water tests are compiled, a snapshot of the performance of each tank in the process circuit can be seen side-by-side.
Once all the numbers from all the samples and water tests are compiled, a snapshot of the performance of each tank in the process circuit can be seen side-by-side.
Willow Creek Dredging Trip
September 2000
When I received an invitation for a Fourth of July dredging trip from my friend Leonard, I thought it a terrific way to not only show respect for America's freedoms, but also as a way to honor the throngs of prospectors whose labors fueled our nation's...
When I received an invitation for a Fourth of July dredging trip from my friend Leonard, I thought it a terrific way to not only show respect for America's freedoms, but also as a way to honor the throngs of prospectors whose labors fueled our nation's...
The Seven Troughs Mining District
September 2016
The favorable geology of the northeastern and central parts of the Seven Troughs Range are the parts most interesting to prospectors. They are underlain by a thick sequence of Tertiary volcanic rocks, mostly rhyolites and andesites.
The favorable geology of the northeastern and central parts of the Seven Troughs Range are the parts most interesting to prospectors. They are underlain by a thick sequence of Tertiary volcanic rocks, mostly rhyolites and andesites.
Rare Earth Deposit May Be Awaiting Discovery
July 2010
Bill and the geologist lost interest and as far as I know, nothing more was done to locate the deposit.
Bill and the geologist lost interest and as far as I know, nothing more was done to locate the deposit.
Our Readers Say
November 2016
The coming election...
The coming election...
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