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The Significance of Boulders in Placer Deposits

The good news about boulders is they can trap heavy minerals. The bad news is moving them out of the way can be a real struggle.

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Critical Minerals: Tungsten


Because tungsten minerals are heavy, exploration can be done using stream sediment samples. Prospectors looking for gold have found scheelite or wolframite in their placer concentrates, and in some cases this has led them to make important tungsten finds.

Guest Editorial—Globalizing Mining in America, Part I


Is it environmental concern that's driving mining out of the United States or rather politics on the grandest scale?

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.

Picks & Pans: Perseverance Pays Off


Tony Kelly and Ken Laster have dredged for gold in the Motherlode area for a number of years, and they decided to team up in 2004 and work together with Ken’s new 4-inch dredge.

Detecting Canyon Bedrock in The Sierras


My plan was to go up the canyon along a ridge and then drop into the canyon whenever I came across a spot that might give me reasonable access.

Legislative and Regulatory Update


Suction dredging court cases in California linger on

California: The Land of Big Nuggets—Part II


There are a number of Tertiary river channels in the area, most of which trend south-southwest. They tend to be steep, narrow, and rich with coarse gold.

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