December 2001 by Edgar B. Heylmun, PhDOnly the so-called “precious gems” will be considered in this article. They are diamond, ruby, sapphire, and emerald. A “gem” must be rare, hard, and durable, and possess a unique color or quality in order to be classified as a gem.
The 760-mile-Iong Baja California peninsula, in Mexico, separates the Gulf of California (Sea of Cortez) from the Pacific Ocean. Most of the peninsula is a desert where the traveler can find some of the weirdest plants on Earth...
Centrifugal bowls versus jigs
In the high country of the Tahoe National Forest is 160 acres of a patented mining claim dating back to its origin around 1853. This is well above the historic mining town of Michigan Bluff and past Deadwood—an old mining town...
Arizona-based International Silver Inc. is proposing an underground silver and zinc mine in Montana and has asked Butte-Silver Bow County to lease them the surface and mineral rights to hundreds of acres.
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.
When I started dredging a short distance downstream from that feature I realized that I was into a major paystreak and much of the gold was coming right out of the upper gravel. I could see the chunky pieces falling out of the gravel as they were pulled into...
The Bawl Mill • Our Readers Say • 43 CFR 3809 Update • Breccia Pipes • Newmont Tries to Become World's Largest • The Final Gold Strike of the Alaska Gold Rush—Livengood Stampede, 1914 • GATA Update • Aussie Gold—A Look at Queensland • Montana's Virginia City Has Golden Legacy • Picks & Pans: Lost Below • Gold in Iceland? • Mining Stock Quotes and Mineral & Metal Prices • Melman on Gold & Silver