Ask The Experts - Concern that gold and silver aren’t considered critical?
November 2020 by Clark Pearson
Gold out of auqa regia
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.
Q: Graphite spray to prevent sticking when using cast iron molds
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