History & Geology
The Oquirrh Mountains, Utah
July 2013 by Bill Rich
...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.
All About Chalcopyrite
…there are loads of different copper minerals, but a large number of them form first in the ground as chalcopyrite and then through the effects of weathering are changed into other minerals like malachite, cuprite and chrysocolla.
The Giant King Mine
Most gold-bearing veins in this region are controlled by fractures associated with the Melones Fault, a late Cretaceous structure that is 108 to 127 million years old.
Potholes and Other Bedrock Traps
Potholes in bedrock can trap placer minerals and even be glory holes. They are, at least, interesting geologic phenomena, and at best, a treasure trove of gold nuggets.
The Amazing Mineral Tourmaline
It is a gemstone, and yet it is also closely associated with many types of metal ores. It's valuable itself but often points toward other valuable minerals—that is certainly something prospectors want to know more about!
Eolian Gold Deposits
Prospectors who specialize in electronic detecting for nuggets in desert areas are especially interested in this type of deposit, as it yields nuggets that are close to the surface of the ground...
Heavy Sands Mining
Lately my mind has been involved with group 4 of the transition elements, namely titanium, zirconium, and hafnium. They all have similar chemical properties. Of greatest interest to economic geologists and miners is that these valuable elements often occur together in sands.
Nevada's Silver City Gold District -- Part II
May 2016...this district has had a continuous life of gold mining and milling that spans 150 plus years, and it appears that it will keep pressing on for many more years of production.
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The Bawl Mill
• Ask the Experts
• Ask the Experts
• The Birimian Greenstone Belts of West Africa
• Study Confirms Mercury Levels Safe in California's Gold Country
• All About Quartz—Part II
• The Pearce Mineralized Area, Dragoon Mountains, Arizona
• An Alaskan in the Lower 48
• Romancing the Rock
• Placer Channel Sampling
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
• Record $11 Million Fine for California Mine
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