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.
The fight over an agreement a northern Wisconsin town passed almost four years ago that endorsed a proposed underground zinc and copper mine near Crandon goes before a Dane County judge next month.
The father-son duo spent years combing this bit of Pennsylvania wilderness with high-end metal detectors, drills and other tools to prospect for a fabled cache of Civil War gold.
Because tungsten minerals are heavy, exploration can be done using stream sediment samples. Prospectors looking for gold have found scheelite or wolframite in their placer concentrates, and in some cases this has led them to make important tungsten finds.
Once indicators start showing up along or below a contact I start to get excited. When I have shale, and outcroppings of diorite with iron-red, gritty soil and some clay thrown in, I really get lightheaded. I may be a mile away from the nearest diggings but that’s okay. I just found a spot that could provide some nice nugget hunting.
With property values trending upward over the past several years, many owners who purchased their businesses years ago are now discovering that the building housing the mining operation or supply business is the most valuable part of their business.
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