All Articles
The Golden Triangle of Sonora, Mexico
May 2001 by Edgar B. Heylmun, PhD
The “Golden Triangle” dry placer district in Sonora, Mexico, lies some 80 to 100 miles south of the border. It is in desert terrain at elevations between 1,900 and 2,300 feet above sea level.
The Rocks That Burn: Is Oil Shale the Answer?—Part I
The day is old in the Rangely Oil Field in northwestern Colorado. I’ve paused in my southbound trip to take a gander at this historic field, one of the largest in the state. Intricate pipelines funnel water and carbon dioxide to the source rock far below.
Small-Scale Concentrating and Recovery Methods
The first step in my recovery process after milling the ore to the desired size is to table it. On this particular ore, I get good results milling it to minus 100 mesh.
Legislative and Regulatory Update
• Idaho miners will challenge new EPA permit at rally
• California proposes to amend definition of a suction dredge
• Proposed rule redefines "navigable waters"
Pebble Deposit Reveals Mineral Potential
The vast potential of the Pebble deposit is becoming more clear each day.
Siskiyou National Forest Update
For the past two years, miners in southwest Oregon have been bombarded by one attack on mining after another.
Melman on Gold & Silver
Perhaps the most important phase of our chart analysis work is to find indicators that have proven reliable in the past in terms of providing indications of future market direction. One of our favorites is the “Bank Index,” better known by its trading symbol, BKX.
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The Bawl Mill
• Original Sixteen to One Goes to Court—Challenges MSHA Citations Part II
• Using Legal Subdivision
• Placer vs. Lode Gold
• Gold Tellurides: Tellurium, an Assay Impurity
• Court Hears Arguments Over Rights to Shipwreck
• Picks & Pans: How to Succeed in a Small Mine, A Case History: 1990-2000
• Charcoal Crucible Recipe
• Discovery of the Mountain Pass REO Deposit
• Romance of the Old Silver King
• Record-Breaking Alaskan Nugget for Sale
• Company Notes
• Nevada Gold Production Up Despite Lower Prices
• Gold in Guatemala
• Bush Taps Utah Resident for Labor Post
• Looking Back
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
• Honda Pares Down Use of Precious Metals in Autos
