How To
How to Interpret Assay Values
January 2018 by Don Robinson
This assay system of ounces per ton sounds simple enough, but the use of the metric system and the additional measuring terms of “grams per ton” and “parts per million” (ppm) has created some misunderstanding of ore value.
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• How do I clean up gold encrusted with iron-sulfides?
Attention to Detail - Part II
Ditches almost always started in the high country and contoured the mountainsides, making a long drop, usually many miles away, to the goldfields. There are ditches in Trinity County that originate at seven and eight thousand feet in the Trinity Alps that carried water almost thirty miles.
Dry Washer, Wet System or Metal Detector?
I love to dry wash old nugget patches found by detector operators, and I have found my fair share of gold dry washing those areas. I have also found a few nuggets using a detector on the bedrock exposed by dry washing the patches.
Ask the Experts
What are the tell signs of garnet deposits?
Recovering Fine Gold with Oleophilic Adhesion
Oleophilic means "affinity to or attracted to oils," and this includes gold an diamonds.
Exploring Placers with Auger Drills
Augers can be used effectively for placer exploration with certain limitations.
A New Method for Handling Stubborn Gravity Middlings
The solution focused on the relative difference in malleability between gold and waste, rather than the difference in density exploited by gravity circuits.
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• California: The Land of Big Nuggets—Part II
• Bedrock Nugget Hunting: Tools of the Trade
• A Primer on Bitcoin and Other Cryptocurrencies
• Gold Hunting on Libby Creek
• PLP and MMAC Update
• Man's Best Friend
• An Interview with Minelab Engineer Mark Lawrie
• Third Largest Nugget in Existence Returns to Dallas
• Melman on Gold & Silver
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