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China Will Put Rio Tinto Employees on Trial
March 2010 by Associated Press
The Australian government confirmed it was notified that a Shanghai court will try the four Rio employees including an Australian national.The Stonewall Jackson Mine, San Diego County, California
For obvious reasons southern California is not known historically for its gold mines. Gold production was concentrated heavily in the Sierra Nevada foothills in the northern part of the state. However, the high mountainous region of eastern San Diego County was the site of a number of productive hardrock gold mines, notably in the late 19th century.
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The Petersville—Yentna Goldfields
Upon first entering this district in the early 70s, the trip into the Petersville area by vehicle was risky at best, especially during rainy periods in summer. The road has been improved somewhat since then, but not much.
Detecting Wet Ground Yields More Fun Than Gold
We all continued over to another location at the top of a massive placer operation. Arriving at the draw, I showed everyone where gold had been found before and we all began detecting.
Mineralized Calderas in Colorado
A caldera is a large circular volcanic depression caused by collapse due to the removal of molten magma from an underlying magma chamber. The removal of magma is due to explosive venting of lava and pyroclastic material.
The Tangential Impulse Water Wheel in California Gold Mining History—Part II
Even before Pelton relocated in San Francisco in 1888, many other competitive foundries and machine shops chose to enter the water wheel market. These firms were already busy with the mining trade, producing hoists, stamp mills, ore carts, Cornish pumps, crushers, grinders, compressors and drills.
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Prospecting for Hard Rock Gold
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