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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.
Looking Back
Excerpts from CMJ published 50 years ago this month.
Court: Kennecott Eagle Minerals Application Complete
The Michigan Court of Appeals overturned a lower court ruling that had blocked the state Department of Environmental Quality from deciding whether to issue a permit for a nickel and copper mine in the Upper Peninsula.
Lithium Fuels Hopes Around Salton Sea
The lake is at the southern tip of the San Andreas Fault, which has shifting tectonic plates that bring molten material closer to Earth’s surface. The only other part of the US known to have more geothermal brine available is on the fault’s other end in Northern California.
Placer Gold Deposits of Utah
The placer deposits of Utah occur in two distinct types of environments. These are 1) placers found adjacent to, and derived from, gold, silver and base-metal deposits; and 2) placers found in major rivers and derived from unknown, distant sources.
Using Legal Subdivision
“Legal Subdivision” is a method used to describe various tracts of land, including most placer mining claims. Anyone wanting to research mining claims in order to find “open ground,” for the purpose of prospecting and/or locating a mining claim, will need to know how to use this tool.
Picks & Pans: Big River Dredging in Northern California
Back in the early 1990s, a gold mining club in northern California (on the Klamath River near Happy Camp), was offering a free "Trial Week" to test their claims. I decided to take them up on their offer. After obtaining a California Dredge Permit, I loaded my trusty Jeep with my camping gear...
Legislative and Regulatory Update
• Election impact
• New Washington State small-scale regulations
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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
