Cobalt and Nickel in Missouri
October 2002 by Edgar B. Heylmun, PhDCobalt and nickel are tough silver-white metals, with similar physical properties, that frequently occur together in nature, along with copper sulfides. Cobalt and nickel are used as alloys, providing great strength and resistance...
The Australian government confirmed it was notified that a Shanghai court will try the four Rio employees including an Australian national.
In this installment we will finish up our discussion of how primary hardrock gold deposits form. Understanding how rock alteration works can lead to some good ideas for exploring around old mining districts.
For 250 years, the Guanajuato Mining District of Mexico produced 20% of the world's silver. The old colonial city of Guanajuato (pop.100,000) is wedged in a narrow canyon in the Sierra de Guanajuato, at an average elevation of 6,750 feet.
The operation and techniques employed are highly successful in producing free gold with minimal work involved while maintaining an environment protection process through the use of recycled water and a settling pond.
Lode gold and silver mines and prospects can be found in many parts of Mono County, from the Sweetwater Mountains on the north to the White Mountains on the south, and at elevations ranging from 5,000 to 12,000 feet. Mining activity on the rugged east flank of the Sierra Nevada is now severely restricted, especially in resort areas and where lands adjoin Yosemite National Park.
Even as late as 1906, Delamar was second only to Tonopah and Goldfield in production outshining many better known areas. Since the first discoveries, more than 700,000 ounces of gold have been produced from the mines here.
It also happens sometimes that glaciers will bury valuable placer deposits. This occurs when the glacier goes over the top of an existing placer deposit.
The Bawl Mill • Our Readers Say • Placer Gold in Idaho • Working the Belmont Mine Butte, Montana—1953 • Simple Sluice Design • Sunshine Mine Video Brings Back Painful Memories • Hardrock Detecting • Gold Garbage: Scams New & Old • Company Notes • Picks & Pans: Confessions of a Professional Nuggetshooter • Gondwana Gold and Diamonds • Looking Back • Ghost Towns of Washington County, Utah • The Fire Within • 2002 California State Gold Panning Championships—Foresthill, California • Mining Stock Quotes and Mineral & Metal Prices • Melman on Gold & Silver