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The Fire Assay of Fly Eyes
July 2002 by Dr. Ralph E. Pray
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.Additional articles that might interest you...
Ask The Experts
January 2016
Gold left in Rye Patch by the time I retire?
Gold left in Rye Patch by the time I retire?
Greenhorn Finds Gold in Colorado
November 2016
Using a snuffer bottle to pick it out of the pan, he continued his panning efforts. He continued to find more yellowish stuff, but it wasn’t shiny like he thought gold should look.
Using a snuffer bottle to pick it out of the pan, he continued his panning efforts. He continued to find more yellowish stuff, but it wasn’t shiny like he thought gold should look.
Accident at Robinson Mine Leaves Two Dead
January 2005
“We are saddened by the loss of two Washington Group employees and our thoughts at this time are with their families,” said Bill Myckatyn, CEO of Quadra Mining.
“We are saddened by the loss of two Washington Group employees and our thoughts at this time are with their families,” said Bill Myckatyn, CEO of Quadra Mining.
Mineralized Calderas in Colorado
May 2002
A caldera is a large circular volcanic depression caused by collapse due to the removal of molten magma from an underlying magma chamber. The removal of magma is due to explosive venting of lava and pyroclastic material.
A caldera is a large circular volcanic depression caused by collapse due to the removal of molten magma from an underlying magma chamber. The removal of magma is due to explosive venting of lava and pyroclastic material.
Millie's Tailings
February 2000
Hardy goldminers enjoyed creating nicknames for their cronies.
Hardy goldminers enjoyed creating nicknames for their cronies.
The Federal Land Survey System
March 1999
When the thirteen original colonies were laid out in what is now part of the United States, they used the English system of metes and bounds.
When the thirteen original colonies were laid out in what is now part of the United States, they used the English system of metes and bounds.
The Significance of Nuggets in Placers
January 2016
Chances are better that both types of gold did not come from the same source. Let's look at the probable conditions to cause two types of gold in a placer.
Chances are better that both types of gold did not come from the same source. Let's look at the probable conditions to cause two types of gold in a placer.
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