All Articles
Greenstone Belts in Minnesota
August 2005 by Edgar B. Heylmun, PhD
Greenstone is a dark greenish-black basaltic rock which, along with chloritized schist, forms belts up to 50 miles wide in northern Minnesota, in rocks of Late Archean age. Most belts are 2.6 to 2.9 billion years old.Additional articles that might interest you...
Ask The Experts
January 2016
Viewing details on Google Earth
Viewing details on Google Earth
Summertime Gold Panning
September 2016
I have smaller pans for cleaning black sand concentrates, big pans for taking large samples, pans with corners for pouring out materials, and pans with lots of special riffles. This variation is why I have so many pans—they each have their specialty.
I have smaller pans for cleaning black sand concentrates, big pans for taking large samples, pans with corners for pouring out materials, and pans with lots of special riffles. This variation is why I have so many pans—they each have their specialty.
International Wayside Resurrects Gold Rush in British Columbia
November 2006
Gold rushes are the stuff of legends. Who can read Jack London’s stories of the Klondike or hear the fabulous tales of the California Gold Rush of 1849 without their heart beating just a bit faster? But there was also a third gold rush, just as dynamic...
Gold rushes are the stuff of legends. Who can read Jack London’s stories of the Klondike or hear the fabulous tales of the California Gold Rush of 1849 without their heart beating just a bit faster? But there was also a third gold rush, just as dynamic...
Flat-Fault Gold
August 2001
Gold and other valuable metals are often deposited in breccia and rubble formed by flat or gently-dipping faults. Such faults are commonly found in areas of crustal stretching caused by the movement of tectonic plates. Flat-faults are especially common in southeast California, southern Arizona, and northern Sonora, Mexico. However, they can be present anywhere that crustal stretching has occurred.
Gold and other valuable metals are often deposited in breccia and rubble formed by flat or gently-dipping faults. Such faults are commonly found in areas of crustal stretching caused by the movement of tectonic plates. Flat-faults are especially common in southeast California, southern Arizona, and northern Sonora, Mexico. However, they can be present anywhere that crustal stretching has occurred.
Ask The Experts
June 2015
Geologic references for northern Nevada
Geologic references for northern Nevada
Chasing Float Gold—The Starry Night Wash
June 2018
The sun was beginning to set, which put the light at just the right angle against the hillsides to where I believed that I spotted a very small dig and tailings pile up the hill near the top of the second wash.
Subscription Required:
The Bawl Mill
• Our Readers Say
• The Paradox Basin—Part II
• A Sleeping Giant
• Buying a Used Gold Dredge
• Looking Back
• Gold in Vermont
• Picks & Pans: Prospecting on Perry Creek
• 9th Circuit Court Hears Pilgrim Family Case
• The First Mine in America
• National Mining Hall of Fame to Induct Five
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
