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Pediments
April 2005 by Edgar B. Heylmun, PhD
A pediment is a broad, gently sloping erosion surface or plain of low relief that is often found in arid and semi-arid regions at the base of a receding mountain front. The example shown is from the Palo Verde Ranch 15-minute topographic quadrangle, southwest of Tucson, Arizona. This is one of the best examples the writer has ever seen.Ask The Experts
What is claim relocation?
A 'Rare' Opportunity for America
All of which brings us back to the question of why we rely so heavily on China in the first place. America’s economy is heavily dependent upon energy and telecommunications, but does that require Chinese manufacturing? Clearly not.
Gondwana Gold and Diamonds
Some 250 million years ago, the Earth had just one supercontinent, known as “Pangaea.” For whatever reason, the supercontinent began to break apart. South America and Africa remained joined, as “Gondwana,” until 65 million years ago, when they split apart. The obvious “fit” of South America with Africa was noted by geologists back in the 19th century, but it was not until Alfred Wegener came out with his “continental drift” hypothesis in 1912 that people took note.
The Trapiches of Chile
In Chile, the trapiche (tra-peach-ee) method of milling gold ore began more than 400 years ago. The first trapiche, also known as a Chilean mill, was a stone wheel weighing two or three tons rotating on an axle.
Common Operations—Small-Scale Mining and Sharing the "Take"
The “Forty-niners,” known as “Argonauts,” separated the loose gold known as “wet diggin’s” from the river gravels using a wash pan. The pan was made of tin or iron and had a flat bottom and sloping sides.
Legislative and Regulatory Update
• Make your votes count
• Court tells Forest Service many access fees are illegal
• Kensington update
Steven's Trail and the North Fork of the American
What were we doing going down a 4.5 mile trail to a cold river where there was no guarantee of anything except some ice and maybe cold hands and feet? First it seemed our winter was going to be a drought, and then all that reversed.
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The Bawl Mill
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• Progress Report on Washington State Small-Scale Regulations
• Bill to Allow Mining of Coeur d'Alene Basin
• Dredging Below the Homestake
• Looking Back
• Picks & Pans: The Glory Hole
• Enthusiastic Crowds at PDAC
• Fraser Institute Survey Results Rank Best (and Worst) Mining Locales
• Synclinal Oil
• Small-Scale Prospecting & Mining (A Little History)
• Higher Zinc Price Creates Opportunity
• Government Appeals Miner Injury Case to Supreme Court
• Mining Stock Quotes and Mineral & Metal Prices
• Melman on Gold & Silver
