All Articles
Enrichment of Gold Veins
November 2000 by Edgar B. Heylmun, PhD
Most of the world's great gold mines are in secondary (supergene) enrichments in veins and stockwork, brought about by physical and chemical processes.
Looking Back
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
Exploration, Development and Taxes
Further demonstrating the importance of seeking professional assistance and advice are the tax rules governing the expenses of a mining company. The tax treatment of mine exploration and mine development costs is confusing, complex and often overlooked or ignored—except by the ever-vigilant Internal Revenue Service.
What To Do When Gold Recovery and Assay Values Differ
Before going into an analysis of the ore composition, two other major factors will affect the result. These are the accuracy of the assay and the effectiveness of the mill for the gold recovery.
Bigger Is Not Always Better
I stayed on the nozzle (about 25 pounds) and Dave moved rock. We worked the hole for two and a half days. Most of the time was spent moving overburden.
Detecting Basics: Lose the Bad Habits Not the Gold
I will make the assumption that when any of you take a detector in your hand and head out prospecting for gold you are probably anticipating finding some gold. That’s the general idea, right?
Melman on Gold & Silver
After weeks, months, even years of eager anticipation, the New Millennium has dawned!
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The Bawl Mill
• Our Readers Say
• The Assay of High Iron Gold Ores
• The Patch
• History of Mining—Bradshaw Mountains, AZ (Part I)
• Picks & Pans—The Green Rock, Rattlesnakes, Good Gold and Ruth's Mine
• The Oretron
• Silver Hill, North Carolina
• Residual, Lateritic and Gossan "Soils" as Potential Nuggetshooting Sites
• Hardrock in Downieville
• Looking Back
• Company Notes
• Gold in Northern Baja California
• California State Gold Panning Championship Results
• Melman on Gold & Silver
• V.P. Contender Addresses Mining Show
