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History & Geology

The Golden Days of Julian, California

Some scattered reports say that gold may have been washed from streams here as early as the 1840s, but the undisputed major discovery came in 1870.

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The Batteries Metal Rush


There is a major change coming in the economy of the world and now is the time for prospectors and miners to grab a ticket and get on board.

Heavy Sands Mining


Lately my mind has been involved with group 4 of the transition elements, namely titanium, zirconium, and hafnium. They all have similar chemical properties. Of greatest interest to economic geologists and miners is that these valuable elements often occur together in sands.

The Amazing Mineral Tourmaline


It is a gemstone, and yet it is also closely associated with many types of metal ores. It's valuable itself but often points toward other valuable minerals—that is certainly something prospectors want to know more about!

Green Valley Gold District, Payson, Arizona


Most gold-bearing quartz veins found in the district were fracture fillings in faults enclosed by crushed quartz zones along their margins. Since the host rocks were often extensively weathered, portions of the veins stood out as positive, resistant outcrops. The gold-bearing veins ranged from a few inches wide to the vein at the Gowan mine that was as much as 12 feet wide. 

Gold in The Silver Crown District, Wyoming


When my field assistant Jay Roberts and I entered the mine, it appeared as if someone just walked out of the mine, turned off the lights and never returned.

The Goldfield Mining District, Nevada—Part I


An example of some of this extraordinary ore was a lot of about four tons from the Florence mine during the last days of a lease that averaged over 300 ounces of gold per ton.

Using Vegetation and Soil Conditions as Prospecting Aids


Wouldn’t it be great if you could know if there is gold in the ground without setting foot on the ground? Well you can, to a certain extent, if you can recognize mined ground from unmined.

Subscription Required:
The Bawl Mill   • Legislative And Regulatory Update   • Ask The Experts—Separating platinum from sands using bubbles   • Ask The Experts—Extraction of micro gold from black sands   • Ask The Experts—Difference between a Geiger counter and scintillator   • Then and Now: Is Gold Really Money?   • Gold, Quartz & Chalcedony—Part I   • Prospecting Australia—Part I   • Oregon Dredge Permit Litigation Update   • Gold From Black Sand Tailings   • The Fine Art of Panning Heavy Sands   • California State Gold Panning Championships   • An Expensive Lesson   • Judge Denies Request To Delay Michigan Mine   • Melman on Gold & Silver

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Mining Districts: A Concept Reborn

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