All Articles
Oil and Gas in Washington
May 1999 by Edgar B. Heylmun, PhD
The state of Washington may have undiscovered oil and gas resources, especially since drilling to date has been clustered in just a few areas.Crushing Quartz in Calaveras County: A Placer Miner Learns New Tricks
I had never run an impact mill before, but anything involving rocks, water and a big electric motor sounded great.
History of Mining—Bradshaw Mountains, AZ—Part II
Last month, the earliest mining areas of the Bradshaw Mountains around Prescott, AZ, were explored in the first part of the article. The Lynx Creek and Walker areas still provide many opportunities for weekend prospectors...
Hard Rock 101: Mechanical Techniques
Since we know that the secret to breaking rock is applying force from the inside out (putting tension on the rock), we will be looking at ways we can generate force using human and machine power.
Placer Testing with Large Samples
Of all the difficult gold placer sites to evaluate, none can compare with trying to dig to bedrock through twenty or thirty feet of soaked overburden through which water is slowly seeping downgrade.
Detectors: Past, Present and Future
Detectors were invented long before I was born, but it was in the 1960s when they started to become an item popular enough to power a fledgling industry. The key development was miniature transistor technology replacing the old fashioned tube technology of the 1950s, making lightweight, affordable detectors possible.
The “Push” for Gold—The Great Nevada Adventure Continues
I got a signal but knew it was small. Still, I was very happy to find something. I continued and got another signal. Yes! A bigger nugget! Then I got another signal.
The American Hill Mine
In the high country of the Tahoe National Forest is 160 acres of a patented mining claim dating back to its origin around 1853. This is well above the historic mining town of Michigan Bluff and past Deadwood—an old mining town...
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