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Greenstone Belts in Minnesota

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.

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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

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