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The Lost Silver Triangle of the Sierra Madre—Part II

Newspaper stories in the spring of 1887 credited Lieutenant Henry O. Flipper with discovering both the long-lost Guaynopa and Tayopa mines. Flipper was in Mexico City in late April and May and a reporter interviewed him.

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Legislative and Regulatory Update


• Meeting planned to address small-scale regulations
• Karuk Tribe update
• Oregon dredgers in their own fight over regulations

Mining Districts: A Short Review of Legal Authorities


Mining Districts are the private regulatory authority granted by Congress recognized to regulate the mineral lands held by the United States and for the disposal to citizens of the United States, by means of development and potentially perfected by patent.

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Getting The Most Value From Your Gold-Quartz Specimens


Just simply crushing up all your specimens for their gold content may be a serious waste of potential cash.

Care and Lubrication of a Model 13 Laboratory Wilfley Table


A Wilfley table works best when all of the mineral being run across it (the pulp) is about the same size.  For this reason, I took a good look at each of the samples.

Enrichment of Mineral Deposits by Weathering—Part I


The exact minerals formed in the concentrated supergene deposits depends much on the type of country rock around the deposit and the chemistry of the deposit itself, but if conditions are right, this process will form some rich patches of bonanza ore, in some places valued at thousands of dollars to the ton.

Looking Back


Excerpts from California Mining Journal, our original title, published 50 years ago this month.

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The Bawl Mill   • Ask the Experts—Why doesn't the 1872 Mining Law apply to all 50 states?   • Ask The Experts—Where do I find information about getting paid for raw gold?   • Understanding Geologic Deposit Models   • Prospecting for Diamonds   • Avino’s Durango Project   • Success With A Detector   • Horsetail Gold   • The Makorakoza of Zimbabwe—Centuries of Prospecting in Gold-Hosting Dolerites   • Melman on Gold & Silver   • Mining Stock Quotes and Mineral & Metal Prices

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