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Ask The Experts: What is a Spanish needle?

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?

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Ask The Experts—Iridium


Q: I believe I have found a deposit that contains iridium. What can you tell me about iridium? Are there any tests I can do in the field to confirm it is iridium? How much is iridium worth? Where can I get it assayed? Can I refine it myself?

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Q: Is this gold or some other metal?

Ask The Experts: Is this BLM demand legitimate?


Q: The Arizona BLM state office has started sending out registered letters to association placer claim holders...

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• Are these gold amounts large enough to interest a mining company?

Ask the Experts - ...Worth further investigation?


Q: About 158,000 tons of ore is estimated to remain on the property. Worth further investigation?

The Portable XRF Gun


While there is no metal detector that will see only gold, there is a device that can reliably distinguish gold from lead, copper, iron or other metals. It is an X-Ray fluorescence tester, sometimes called an XRF gun.

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Market for scheelite concentrates?

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The Bawl Mill   • Ask The Experts: Sulfides and fluxes   • Legislative and Regulatory Update   • Simple Rules of Gold Geology: Comparing Epithermal and Mesothermal Deposits   • The "Madonna Nugget"—A Weekend Hunt to Remember   • The Goldfield Mining District, Nevada—Part II   • Sunset Sunbaker   • A Prospecting Adventure in Mexico   • Critical Minerals: Tungsten   • Police Urge Author to End Treasure Hunt   • Melman on Gold & Silver   • Mining Stock Quotes and Mineral & Metal Prices

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