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History & Geology

Gold, Quartz & Chalcedony—Part I

Gold has always been noted to have an affinity for quartz to such a degree prospectors almost always dig on quartz veins in a search for the precious metal.

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The Oquirrh Mountains, Utah


...we will visit three dormant mining districts that lie in the Oquirrh Range in Utah. Some major activity that transformed the lives of thousands of people occurred here from the mid 1860s to the late 1990s.

Sulfides and Intergrain Gold Wire Nuggets


...these nuggets have not traveled far from the lode because the golden wire lattices would have been torn apart or flattened during weathering of rock and deposition by violent stream action.

Critical Metals: Copper


From time to time I’ve been doing a series on critical metals and how important they are to our complex and technological society. This month we are going to take a look at copper, and how important that metal is to our modern lives.

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.

Las Médulas—The Gem of the Roman Gold Mines


This mine was a real wonder of engineering, and the water supply and drifts had to be carefully managed to keep it in operation. In fact, it didn’t close due to lack of gold, but instead closed with the fall of the Roman Empire.

It Pays to Know Your Bedrock


On our last trip, we brought ropes and went down the first waterfall forty vertical feet, only to be confronted by a second, sixty-foot-high, overhanging waterfall that emptied into a slot canyon.

Alaska's Cripple Creek Mining District


If developed with metal detecting in mind, this virgin ground could be a bonanza for nugget hunting.

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The Bawl Mill   • Legislative And Regulatory Update   • Ask The Experts—Separating platinum from sands using bubbles   • Ask The Experts—Extraction of micro gold from black sands   • Ask The Experts—Difference between a Geiger counter and scintillator   • Then and Now: Is Gold Really Money?   • Prospecting Australia—Part I   • Oregon Dredge Permit Litigation Update   • Gold From Black Sand Tailings   • The Fine Art of Panning Heavy Sands   • California State Gold Panning Championships   • The Golden Days of Julian, California   • An Expensive Lesson   • Judge Denies Request To Delay Michigan Mine   • Melman on Gold & Silver

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Mining Districts: A Concept Reborn

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