Ask the Experts

March 2013 by Chris Ralph

Which Specific Gravity Test Works Best?

August 2011
Have you ever wondered how accurate specific gravity tests are in determining the amount of gold in a specimen?

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May 2015
What type of sluice box for my trommel?

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: More suggestions for dealing with metallic trash....

August 2012
Q: Thanks for the great article in the recent ICMJ [“Metallic Trash—Scourge of the Prospector,” July 2012]...

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November 2015
• Can you please shed some light on the material I collected...?

Ask the Experts

March 2013
Need some help putting together a BLM proposal.

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

December 2011

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