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Prospecting & Detecting

Study Confirms Mercury Levels Safe in California's Gold Country

While the Water Board documented the selenium levels in fish and noted they exceed the levels of mercury, they have yet to acknowledge the numerous scientific studies that show selenium effectively neutralizes the effects of mercury.

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Hunting for Hardrock: The Basics


Exposed veins and outcroppings can be a great source for gathering good gold ore for processing. Veins and outcroppings do require a lot of work to free the ore from its earthen grip, but this labor can be very rewarding.

The Essentials of Dry Washing


Most dry washers have a feed rate adjustment. It needs to be set so that the material flows evenly over the riffles and does not bury them.

Proper Spacing of Placer Sample Sites


The zone of influence of each sample must be carefully considered when deciding how far sample sites should be spaced from each other.

Proven Strategies for Detecting Gold


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Fells Flat Gold


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The Smell of Gold—Part I


Some claim they can smell gold. This may be, but when I take a whiff of gold, I smell dirt, rotten eggs, garlic or just nothing: my nose is everything but sensitive.

Q&A With Detector Designer Dave Johnson


...it’s been a little known secret that one man was involved in designing many of the most respected very low frequency (VLF) nugget detectors on the market. Dave Johnson has designed gold-oriented detectors for Tesoro, Whites, Fisher and others for more than 25 years.

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