Ask the Experts

July 2014 by Chris Ralph

Ask the Experts

March 2014
Gold out of auqa regia

Ask The Experts—Using classifiers

December 2010
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.

Ask The Experts

September 2015
Ore processing in California?

The Portable XRF Gun

November 2012
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?

November 2018

Ask the Experts

July 2014
What to do with black sands

Ask The Experts

March 2016
Can a metal detector be used to find limonitic gossan material?

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