All Articles
Breccia Pipes
December 2001 by Edgar B. Heylmun, PhD
A breccia pipe, or chimney, is an irregular cylindrical mass of breccia that is often silicified and stands out as an iron-stained knob. They can be from a few feet to several hundred feet in diameter, and may or may not be mineralized.
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Drywashing Rules Clarified
May 2002
Carson Culp, Assistant Director of Minerals, Realty and Resource Protection for BLM, sent out an internal memorandum to all state BLM directors to clarify rules pertaining to gas-powered drywashers.
Carson Culp, Assistant Director of Minerals, Realty and Resource Protection for BLM, sent out an internal memorandum to all state BLM directors to clarify rules pertaining to gas-powered drywashers.
Explosives Camp Lets Students Explore Booming Career Path
September 2005
Ahhh, summer camp. Lazy days frolicking at the pool. Meeting new friends and swapping stories around the campfire. Slicing steel I-beams and concrete pillars and blowing them apart with C4 high explosives.
Ahhh, summer camp. Lazy days frolicking at the pool. Meeting new friends and swapping stories around the campfire. Slicing steel I-beams and concrete pillars and blowing them apart with C4 high explosives.
The Bawl Mill
December 2009
• Whose interests are they really representing?
• Saved by creative math
• Whose interests are they really representing?
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Melman on Gold & Silver
May 2004
A very famous quote that appears particularly relevant to the past month is one attributed to former British Prime Minister Harold MacMillan. When asked what could most easily derail a government, he replied, “Events, dear boy, events.” We certainly had events in abundance this past month.
A very famous quote that appears particularly relevant to the past month is one attributed to former British Prime Minister Harold MacMillan. When asked what could most easily derail a government, he replied, “Events, dear boy, events.” We certainly had events in abundance this past month.
The Tangential Impulse Water Wheel in California Gold Mining History—Part I
February 2004
The modern tangential impulse water wheel, a device best suited for hydroelectric power production where high water head is available, is an ingenious device born in the historic gold mining industry of California in the 19th Century.
The modern tangential impulse water wheel, a device best suited for hydroelectric power production where high water head is available, is an ingenious device born in the historic gold mining industry of California in the 19th Century.
Ask the Experts
April 2012
Q: ...where would you recommend selling class rings and other scrap gold?
Q: ...where would you recommend selling class rings and other scrap gold?
The Golden Highway—Tuolumne County
October 2003
Heading north into Tuolumne County on California’s Highway 49—the “Golden Highway”—from Mariposa County, you see few traces of the gold rush days because the largest mining town of the period is now covered by Don Pedro Reservoir. If you slow down and take a careful look, along the shores of the lake are numerous streaks of tailings that mark the mines of the old town of Jacksonville.
Heading north into Tuolumne County on California’s Highway 49—the “Golden Highway”—from Mariposa County, you see few traces of the gold rush days because the largest mining town of the period is now covered by Don Pedro Reservoir. If you slow down and take a careful look, along the shores of the lake are numerous streaks of tailings that mark the mines of the old town of Jacksonville.
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