The Significance of Boulders in Placer Deposits
February 2010 by Jim HalloranThe 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.
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.
Is it environmental concern that's driving mining out of the United States or rather politics on the grandest scale?
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.
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.
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.
Suction dredging court cases in California linger on
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.
The Bawl Mill • Legislative and Regulatory Update • Mining Reform and Congress • Placer Mining in Canada's Yukon Territory • California's Rich Pocket Mines • Oregon Suction Gold Dredgers Score Big Win • Michigan Approves Nickel, Copper Mine • Desert Drywashing • The History of Gold Mining in Sierra County • Mining Stock Quotes & Mineral and Metal Prices
Melman on Gold & Silver