The Fire Assay of Fly Eyes
July 2002 by Dr. Ralph E. PrayColorado-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.
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
There are strong opinions on both sides after the Bush administration issued a rule ending the Clinton-era Roadless Rule.
While gold nugget detecting with a pulse induction machine, most people will be swinging a mono search coil and will have their machine set in all-metal mode. However, the newer pulse induction machines can and will discriminate iron very effectively...
• And the award goes to...
• How about a cold one?
Excerpts from Northwest Underground Explorations' soon-to-be published "Discovering Washington's Historic Mines, Volume 2—Mines of East Central Washington State."
• The next step towards implementing the Wildlands Project
• Former timber lobbyist named to oversee Forest Service
Q: What amount of silver is considered the best find ever?
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