All Articles
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...
Fly Fishing the Mine Tailings/Headwaters of the Clark Fork, Montana
September 2001
Outside of Butte, Montana, going north on I90, you’ll pass through a landscape where the old Anaconda mining company processed thousands of tons of ore twenty years ago. We meant to fish in the vicinity of this historic mining district though we knew it is a Federally classified Superfund site for reclamation now.
Outside of Butte, Montana, going north on I90, you’ll pass through a landscape where the old Anaconda mining company processed thousands of tons of ore twenty years ago. We meant to fish in the vicinity of this historic mining district though we knew it is a Federally classified Superfund site for reclamation now.
Critical Metals: Zinc
May 2014
In this article, part of an ongoing series taking a look at critical metals in our economy, we will examine the mining and use of the metal zinc.
In this article, part of an ongoing series taking a look at critical metals in our economy, we will examine the mining and use of the metal zinc.
Chinese Camp, California and the Tong War of 1856
February 2000
In an enterprise known for its boom-to-bust pattern, Tuolumne County produced some of the most productive and enduring gold mining towns of the last half of the 19th century in. California.
In an enterprise known for its boom-to-bust pattern, Tuolumne County produced some of the most productive and enduring gold mining towns of the last half of the 19th century in. California.
Legislative and Regulatory Update
March 2012
• California suction dredging regulations
• Draft Coho recovery plan for Southern Oregon, Northern California
• Sage-grouse
• California suction dredging regulations
• Draft Coho recovery plan for Southern Oregon, Northern California
• Sage-grouse
Update: Public Lands for the People
October 2010
The Bawl Mill
September 2010
• Pouring money down an artsy drain...
• Big government gets even bigger
• California leads the way...to financial ruin
• Pouring money down an artsy drain...
• Big government gets even bigger
• California leads the way...to financial ruin
Gold Near Boulder, Colorado
July 1999
Several mining districts near Boulder, Colorado mark the northeast end of the 240-mile-Iong Colorado Mineral Belt, which cuts diagonally across the Rocky Mountains.
Several mining districts near Boulder, Colorado mark the northeast end of the 240-mile-Iong Colorado Mineral Belt, which cuts diagonally across the Rocky Mountains.
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