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The Fire Assay of Fly Eyes

Colorado-Utah-Wyoming oil shale was first reliably discovered to contain gold and silver by the U.S. Bureau of Mines in the 1920s. Although most of this vast shale resource, up to 1,000 feet in thickness, contained nil or barely detectable values, many brown shale samples fire assayed here over the past thirty years have yielded up to 0.02 ounces per ton (opt) Au and 2.0 opt Ag.

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The Bawl Mill   • Our Readers Say   • Siskiyou National Forest Update   • Company Looks at Restarting Sunshine Mine   • Piedmont Gold   • Gold & The Dollar   • Picks & Pans: Exploring Wyoming's High Desert   • Sons of Gwalia & Herbert Hoover   • Looking Back   • Prospecting on the Yukon River   • Placer Gold in Arizona   • Bill Could Create New Silver Market   • 2002 Inductees to the National Mining Hall of Fame   • Mining Stock Quotes and Mineral & Metal Prices   • Melman on Gold & Silver   • Mystery of Olmec Jade Solved

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