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Carbonatites
February 2005 by Edgar B. Heylmun, PhD
Carbonatites are rocks that formed from molten calcite or dolomite. The thought of calcite being molten lava is difficult to accept, but it was confirmed when it poured out of a vent in Tanzania in 1960.The Ocampo District, Chihuahua
The village of Ocampo is wedged in a canyon about 178 miles, by Mexican Highway 16, west of the city of Chihuahua. It is a few miles west of Basaseachic Falls, and a few miles south of Highway 16, in high chaparral at an elevation of 6,500 feet. The completion of Highway 16 across the Sierra Madre Occidental greatly improved access to the region...
The Bawl Mill
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VMS Deposits in Central Arizona
Volcanogenic Massive Sulfide (VMS) deposits in the Central Arizona Precambrian volcanic belt occur within a felsic package of volcanic rocks capped by an exhalite unit comprised of cherts, iron formations and siliceous members.
Looking Back
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
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Ask the Experts
What to do with black sands
Time to Come Home
The need to bring mining back to North America is more urgent than ever.
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The Bawl Mill
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• Mining Stock Quotes and Mineral & Metal Prices
• Looking Back
