All Articles
History of Oil in California
February 2001 by Edgar B. Heylmun, PhD
Oil is a naturally occurring combustible fluid of organic origin that is commonly found in California and in many other parts of the world.How Deep Can That Detector Go?
Knowing how to get the greatest depth performance out of your detector can be a handy thing, but it’s not an easy, simple matter.
Ask The Experts: Assay problem or recovery problem?
Q: I have tried various leaching techniques from which I cannot get a precipitate.
Look Harder
February 2024Gold in Moffat County, Colorado
The area of interest in this article is in eastern Moffat County, located in northwestern Colorado adjacent to the Wyoming line. It is a high, sagebrush prairie which ranges from 6,200 to 7,200 feet in elevation, north and northwest of the county seat of Craig (pop. 8,000).
Carissa Gold Mine Comes Back to Life
The mine will be open for public tours Saturday and Sunday afternoons beginning August 24, lasting into the fall and winter as weather permits.
Hard Rock 101: Small-Scale Blasting
…the process remains much the same: Drill holes, load explosives, close up the holes, blast and muck out the resulting broken rock.
Gold
Excerpted from the U.S. Geological Survey's 1998 Annual Review by Earle B. Amey, Gold Commodity Specialist.
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• Legacy of the Wandering Jew Mine
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• Identifying Gold Ores
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