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History & Geology

Mineralized Faults and Contacts in the Search for Gold

Fault zones and rock contacts are important because the vast majority of gold and silver deposits, as well as those of many other metals, are formed by hot, mineralized water solutions.

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Detecting for Gold in Australia—The Kimberley Trip


The hair stood up on the back of my neck when I saw this, especially the nice patches of wash in the bottoms of the gullies, a sure sign of an auriferous source being nearby.

The Goldfield Mining District -- Then and Now


In 1983, some of the ore yielded more than 2,500 ounces of gold within 30 feet of the surface. The shoot pinched to a narrow vein.

Ask The Experts


Q: Is this gold or some other metal?

The Rochester Mining District of Nevada


Only the richest ores could be worked and shipped off for processing at a profit. As a result, early mining in the southern part of the Humboldt Range was short-lived. In the 1880s, placers were discovered in Spring Valley and American Valley on the east side of the range...

Preserving the True History of the Ivanhoe


My partner had the contacts and it wasn’t long before we had an agreement in place and the company had a geologist on site. I recall a time when he was getting the lay of the land, so to speak, and he broke off a rock sample and inspected it with his magnifier.

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.

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The Bawl Mill   • Ask The Experts   • Ask The Experts   • Ask The Experts   • Ask The Experts   • Detector Prospecting Accessories   • Electrum: Gold and Silver Together   • Drywashing Arizona Gold   • Sunshine and Gold   • A Successful Trip Through Gold Basin   • Oregon Miners File for Summary Judgment   • The Significance of Nuggets in Placers   • The Strange History of the Utica Mine   • Forest Service Seeks to Lock Miners Out in South Dakota   • Maitland Bar Nugget to Go On Display   • Company Says Central Idaho Project Feasible   • Melman on Gold & Silver   • Mining Stock Quotes and Mineral & Metal Prices

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