History & Geology
Critical Metals: Copper
May 2012 by Chris Ralph
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.
The Potholes—California’s Oldest Known Mining District
Every time we prospected here we found gold, sometimes some really coarse flakes, but no large nuggets (yet).
Alaska: Kodiak Islands Mineral Resources
The fresh material is worked and concentrated by the waves on the flat, wide beach platform. The waves wash away the lighter minerals, leaving the heavies near the bluffs and in depressions on the beach.The Goldfield Mining District, Nevada—Part II
The majority of the gold produced in Goldfield has come from ores that are close enough to the surface to be oxidized by the air. This oxidized ore is normally a soft, shattered, earthy material usually stained yellow to brown by oxides of iron.
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.
Why So Much Gold in Nevada?
Nevada produces about 75% of all the gold mined in the US. This means that all the other 49 states combined only produce 25%, and this includes California, Alaska and Arizona.
Fabulous Florence—The Golden Town of Idaho
In September 1861, on a round-about prospecting journey homeward, five California gold miners discovered gold in the area now called Florence. While watering the horses, one of the men noticed a golden color on a piece of slate bedrock in the stream...
Connecting With The Past With Gold Rush Coins
September 2023
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The Bawl Mill
• Ask the Experts: gold per ton; improving assay method
• Bering Sea Gold—Part II
• Tucson Show Marketing
• Ganes Creek Hits 10 Years—Part I
• Fabulous Florence—The Golden Town of Idaho
• Arizona's Vulture Gold Mine and Lost Dutchman
• Replacing Your 12-Volt Pump
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
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Legislative and Regulatory Update
• Ask the Experts: Ionizing mercury
• El Tigre—Unlocking Values in Tailings to Jumpstart a Mine
