Ask The Experts - What Do I Look For and How Do I Sample?

April 2018 by Chris Ralph

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

February 2013
Q: How do metal detectors work around precious metal ore bodies?

Ask The Experts

June 2015
If it's gold, how should I clean it?

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

May 2016

• Can I get advice on a hard rock property in Calaveras County, California?

Ask the Experts—How do you determine how far a piece of gold has traveled in a stream?

December 2011

Ask the Experts

April 2012
Q: Can a voltmeter be used to determine the type of metal/mineral present in soil?

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