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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Shaker tables and jigs
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How do mines and refiners deal with doré bars?
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Centrifugal bowls versus jigs
Ask The Experts - What is the “blue lead?”
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