History & Geology
Exploring Iron Oxide Copper Gold Deposits
November 2017 by Chris Ralph
The excitement over IOCG deposits began with the discovery of a monster deposit at Olympic Dam in Australia in 1976. The discovery was accidental as the operator was searching for strata-bound copper deposits.
Sierra County Gold—Part I
...this county contained some of the richest placer ground found in all of California and still produces some pretty impressive finds to this day.
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.
The Golden Days of Julian, California
Some scattered reports say that gold may have been washed from streams here as early as the 1840s, but the undisputed major discovery came in 1870.
Prospecting Homonyms
Three homonyms come to mind when I think of gemstones, gold and vegetables: carrot, carat and karat. Let’s look at carrot first.
Ask The Experts
Q: Is this gold or some other metal?
Placer Gold Deposits of New Mexico
While a large number of locations have yielded some placer gold, most of the state’s placer production has come from a few productive districts.
Conrey Dredge No. 4—Part II
These were the men who periodically picked up the gold amalgam from the tables and sluices in the dredge, processed it, and transported the gold ingots to the railroad express office in Alder. Their trustworthiness must have commanded a prominent wage.
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The Bawl Mill
• Legislative and Regulatory Update
• Ask The Experts - How do I work this glacial deposit?
• Ask The Experts - How do I best recover gold in pyrite?
• It Pays to Know Your Bedrock
• BLM Cancels 10-Million-Acre Sage Grouse Mineral Withdrawal
• Take it to Bedrock
• The Beatty Mining District of Nevada
• Flood Plain Gold Deposits—What Are They Really?
• Conrey Dredge No. 4
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
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Over the Divide: Nancy Glenn; Sondra (Adelson) Bernzweig
