The Golden Days of Julian, California
October 2011 by Frank Lorey IIISome 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.
There are a number of Tertiary river channels in the area, most of which trend south-southwest. They tend to be steep, narrow, and rich with coarse gold.
The steeper the gradient is, the more potential erosive power to move gold and other bedload sediments, and the more power to remove obstacles to flow.
...this county contained some of the richest placer ground found in all of California and still produces some pretty impressive finds to this day.
The other distinguishing feature of calcite has to do with its chemistry. Geologists sometimes take a small bottle of dilute hydrochloric acid out into the field with them because calcite reacts with acids to make a bubbly foam.
Epithermal deposits form in the ground at shallow depths. They are popular with prospectors because can yield very rich deposits and they are widespread in the Western US.
Narrowing down a closure date will allow you to check the commodity price during that time and possibly confirm that a low price, rather than a lack of ore, was the driving force that closed the operation.
Ivory Coast has considerable gold reserves, and this nation has the largest area of greenstone belts prospective for gold in the continent.
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