Buell Park Pipe, Arizona
July 2004 by Edgar B. Heylmun, PhDOne of the world’s largest kimberlite pipes is located on the Navajo Indian Reservation in northern Arizona. The pipe is larger than any diamond-bearing pipe in South Africa. It is 16 miles north of Window Rock, the capital of the Navajo Nation.
In the 1980s, I spent 5 summers living in a tent in order to map the 450 mi2 South Pass granite-greenstone belt and many of its historic mines. While mapping, I was quite impressed by the general lack of development of lode gold deposits.
“They’re taking it to the grave with them.” These words came from my Canadian mining partner when we discussed what he had learned from an elderly gentleman in a nursing home. While that particular visit was not very successful, we had a number of others that worked out far better.
Zinc is brittle and crystalline at ordinary temperatures, but when heated to between 110°C and 150°C it becomes ductile and malleable; it can then be rolled into sheets. The bluish-white metal is used principally for galvanizing iron, but also...
How to locate diamonds: This article focuses on the principal host rock for diamond and describes some gemstones (and kimberlitic indicator minerals) typically found with diamond.
The theory of making the gold wheel work is really very simple—classification. When all the materials introduced into the wheel are classified to the same mesh, the heaviest materials will be extracted...
The Bawl Mill • Mining Claim Fees Are Going Up • Our Readers Say • Mines and Money • Understanding Hard Rock Mining: Terms and Methods—Part II • Two Nevada Mines Look to Supply Own Power • Paleontonlogical Resources Preservation Act • Picks & Pans: Mexican "Edventure" • Over the Divide • Flat-Fault Gold in Sonora, Mexico • Looking Back • The Fern Mine • Map Offers Look at Butte's Mining History • Gold in China • 2004 National Mining Hall of Fame Inductees • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices