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Gold in Sonora
December 1999 by Edgar B. Heylmun, PhD
The state of Sonora, slightly smaller in area than Utah, lies in-northwestern Mexico, adjoining Arizona to the south. It is characterized, on the east, by a high volcanic plateau, the Sierra Madre Occidental, which forms its boundary with Chihuahua.AMRA Takes On USFS in Idaho
Mr. Hughes was obviously shaken by our interaction and we are quite confident he assumed we were all missing teeth, long-haired, uneducated, backwoods miners who would immediately become submissive. That didn’t happen...
Legislative and Regulatory Update
• Meeting planned to address small-scale regulations
• Karuk Tribe update
• Oregon dredgers in their own fight over regulations
The Old Dutch Cleanser Mine
The naturally occurring white scouring powder called Old Dutch Cleanser, originally from Kern County, California, is a household helper known throughout America. As a sink, stove, and tub cleaner, the abrasive pumicite is one of...
Our Readers Say
Hardrock Mining Accidents Claim Four Lives
Hardrock mining in the US has been hit by a tragic streak of mining accidents in recent months.
Double-D Coils and Their Place in the Goldfields
While gold nugget detecting with a pulse induction machine, most people will be swinging a mono search coil and will have their machine set in all-metal mode. However, the newer pulse induction machines can and will discriminate iron very effectively...
Enrichment of Mineral Deposits by Weathering—Part II
While both zinc and lead deposits also are enriched by the surface weathering process, in part two we will look at the enrichment process for copper and also gold deposits, and at the interpretation of leached outcrops to figure how rich the concentrated deposits below them may be.
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The Bawl Mill
• Over the Divide
• Our Readers Say
• Desert Phone Trashed
• ICMJ Elected Prospecting Magazine of 1999
• Advertising Manager Leaving ICMJ
• Guest Editorial—California "Special" Dredge Permits in Jeopardy
• The Search Continues
• Guest Editorial: U.S. Government—Like Nobody's Business
• Circulation and Collections Manager Leaving ICMJ
• Company Notes
• House Chair Requests Records on Forest Decision
• BLM Wants to Withdraw South Pass Public Land
• Silverton Preserving Lofty Symbol of Mining Era
• Hijackers Make Off With 660 Pounds of Gold
• Prospecting With a Magnetometer
• 1999 Tables of Content
• Lighting the Way Underground 1860-1940s
• Millie's Tailings
• Picks & Pans: Crevicing & Sniping for Placer Gold
• Looking Back
• Forest Service Boss Quits in Bull Trout Flap
• Melman on Gold & Silver
• European Gold Miners Seek Clarification Letter
• Mining Stock Quotes and Mineral & Metal Prices
• Squeezing Diamond Into Graphite
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Legislative Update
