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?
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Is it possible to use a cell phone GPS away from cell towers?
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How do sluicing and drywashing compare in effciency?
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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• What's worth picking out of the pan besides gold?
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Geologic references for northern Nevada
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Market for scheelite concentrates?
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The Bawl Mill
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