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Can I treat a sample with muriatic acid?

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Gold out of auqa regia

Ask The Experts—Using classifiers


Q: I would like to know how to use a classifier when I dump my gravel into my sluice box. I would also like to know what sizes classifiers come in. I know that they are in sizes like -3/4. What does the “minus” in the size mean? Thanks for any help you can give me.

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Ore processing in California?

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.

Ask The Experts - Is LR2000 working correctly?


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What to do with black sands

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Can a metal detector be used to find limonitic gossan material?

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