All Articles
The Boludo Placers, Sonora
November 2004 by Edgar B. Heylmun, PhD
The Boludo placers described here include gravels that have been listed under many different names, including Altar, Golden Triangle, Llanos del Oro, San Francisco, and Trincheras, among others. The placers are on desert flats at the northwest end of Sierra Santa Rosa, about 2,600 feet above sea level. It is in a region of northwest-trending mountain ranges separated by broad desert valleys.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.
Drywashing and Detecting for Eluvial Placer Gold Research is the Key to Success—Part I
How many of you remember hearing or reading the phrase, “only a small percentage of the earth’s recoverable gold has been found?” This more aptly applies to large mining corporations having the means to develop and run large...
Guest Editorial—Unreasonable Interpretations
Throughout the colorful history of mining, reviews of old documents and stories have led to new mineral discoveries.
Gold Prospecting for Better or Worse: All Work and No Pay
At first we decided to see what the flat by our camp would produce where the old-timers had worked it with their Pelton wheel and dragline buckets.
Legislation and Regulation
October 2023Rise Gold to Assert its Vested Right to Mine at the Idaho-Maryland-Brunswick Mine (the "IM Mine")
Ask the Experts
Questions regarding patented and unpatented mining claims and the legal rights surrounding them.
Subscription Required:
The Bawl Mill
• Editorial: Montana's Controversial Rock Creek Mine
• First Load of Concentrate Leaves Reopened Ruth Mine
• Uranium Industry Enjoys Rebound as Prices Nearly Triple
• BLM Warning About Purchase of Mining Claims on the Internet
• Determining the Amount of Gold in a Quartz Specimen
• Placer PGMs in Coon Creek, California
• Getting Your Float Circuit Layout Right
• Pick Up Austria's New Coin—If You Can Lift It
• New Prospecting Guides Available Online
• Police Extend Detention of Newmont Executives
• Picks & Pans—Drywashing and Detecting in Southern California
• Over The Divide—Merwin (Merv) H. Hemp
• The Golden Highway—Placer County
• Northwest Miners Rally a Success
• Mine Threat Just a Stunt to Criticize Land Laws
• MINExpo 2004 Convention Report
• Looking Back
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
