History & Geology
The Golden Days of Julian, California
October 2011 by Frank Lorey III
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.Polymetallic Skarn Deposits
Polymetallic skarn deposits are an interesting class of deposits that can contain a number of different types of metals.
Detector Brings New Life to An Old Lode Mine
…it was immediately evident the previous owner had not been using a detector. During just a few months of working the dumps part-time, he recovered gold in quartz specimens valued in excess of $40,000.
Gold: Is It Everywhere?
Gold, on the other hand, is super rare, and is one of the rarest elements in the earth’s crust. It averages only 0.000004 percent of the earth’s surface. That is four parts in a billion.
All About Pyrite
Most prospectors learn early that pyrite is fool's gold...but the truth is it can be an excellent indicator mineral for gold and in many cases does contain small amounts of gold.
Nevada's Silver City Gold District—Part I
The name Silver City is quite ironic as it doesn’t really fit the area’s metal production. The area encompassing the Silver City district is a great, stand-alone gold district, where the production value of gold has been much more than that of silver. Since the initial discovery of gold-bearing veins in the mid-1850s, the area has been a center of continuous small and large-scale gold production.Critical Minerals: Titanium—Part II
There are both hard rock and beach sand types of titanium deposits, but the hard rock deposits need to be at least 10 percent titanium while the beach sands often are economic with only two or three percent titanium.
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.
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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
