Ask The Experts
Ask The Experts: What is a Spanish needle?
July 2017 by Chris Ralph
Some fellow in Texas was selling a Spanish needle—a dousing device used to recover minerals in the old days. Do you know anything about these?
Ask the Experts: More suggestions for dealing with metallic trash....
Q: Thanks for the great article in the recent ICMJ [“Metallic Trash—Scourge of the Prospector,” July 2012]...
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Can a metal detector be used to find limonitic gossan material?
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Is it possible to use a cell phone GPS away from cell towers?
Ask The Experts—How do you amend a placer claim?
Q: How do you amend a placer claim?
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Q: A few questions about diamonds...
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Options for affordable crushers for small mining operations
Ask The Experts—Amalgamation
Q: Exactly how does amalgamation work? Does it “melt” the gold (or copper, or silver, etc.) and form an alloy? If one leaves a piece of gold in mercury, will the entire sample become an amalgam (combination) of gold and mercury? Or does it only affect the surface...
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