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Spanish Silver in Arizona
October 2001 by Edgar B. Heylmun, PhD
When Spaniards entered what is now Arizona, they encountered diggings made by Opata Indians. The Opata Indians, who now live and mine in the northeastern part of the state of Sonora, Mexico, were one of the few Indian tribes that was...Fire Agate in Arizona
Agate, a banded form of chalcedony (cryptocrystalline quartz), has been used as a gemstone for over 7,000 years. Romans cut and polished agate, and this practice was taken to new heights in Germany in the 16th century.
Potential Gold at Old Hydraulic Sites
So why would a modern-day prospector want to learn about a method of mining that was banned by the courts more than a century ago?
Gold Trader, Employee Charged with Wife’s Killing
A wealthy gold trader was charged with paying one of his workers to arrange the stabbing death of the businessman’s estranged wife...
Ask the Experts
Shaker tables and jigs
Legislative and Regulatory Update
- Zinke leaving office
- Property rights triumph over critical habitat says Supreme Court
- Water of the United States
Ask The Experts: Assay problem or recovery problem?
Q: I have tried various leaching techniques from which I cannot get a precipitate.
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