The San Juan Mountains, Colorado
September 2001 by Edgar B. Heylmun, PhDThe rugged San Juan Mountains of Colorado rise to 14,309 feet and were a barrier to overland travel for many years. Precipitation, in the form of summer thundershowers and heavy winter snow, is enough to support coniferous forests.
The signs of copper, which the prospector most commonly sees in the field in outcrops and on the surface, are secondary minerals caused by the action of air and water on the original copper-bearing sulfides that were deposited deep...
Once you have a detector, learn how to use it and get out in the field—you can’t find anything with it in your garage.
How much is that old Mining Journal worth?
The considerable richness of the gravels is shown by the fact that operators have successfully worked the same river sections for over 20 years.
It is becoming increasingly clear that Barack Obama will be an activist President. Unlike his predecessors, he appears set on using the powers of government in an unusually aggressive manner in order to accomplish “public good.”
The gold and copper deposits at Oyu Tolgoi, or “Turquoise Hill,” are among the largest ever found and could give impoverished Mongolia its biggest boost since it abandoned communism 15 years ago—if the Mongolians can figure out how to profit from it.
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The Bawl Mill • A True Endangered Species • Guest Editorial—Vertical Disintegration • USGS Reports Increase of Imported Minerals • A Silver Opportunity • Gold in Virginia • Picks & Pans: DEF Prospectors Rally Was a Huge Success • News From GATA • Our Nugget Shooting Adventure • How PGMs Affect Assay Beads • Fly Fishing the Mine Tailings/Headwaters of the Clark Fork, Montana • Company Notes • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices