All About Chalcopyrite
March 2017 by Chris Ralph…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.
...two jadeite locations in California have been thoroughly researched by geologists. There are no doubt others that lie in wait.
The Gold Rush in California called hundreds of thousands of souls to leave their homes to journey to the the far reaches of the West. At first the rich goldfields of the Sierra Nevada beckoned to these adventurous pioneers.
In this second part on cobalt, I will take a look at the various types of cobalt deposits and how you can prospect for them. Who knows—perhaps the next big cobalt strike will be yours.
Chances are better that both types of gold did not come from the same source. Let's look at the probable conditions to cause two types of gold in a placer.
...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.
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.
Geology is a science of general tendencies with frequent exceptions, not one of hard and fast rules that are always true and never vary. For almost every well-accepted rule of gold deposits, I can point you to a number of important exceptions.
The Bawl Mill • Ask The Experts: Can you review the differences in dry washers? • Ask The Experts: Will this detector work for me? • Ask The Experts: Nickel assays • Ask The Experts: Potential for developing magnesite deposit • Our Readers Say • Selectable Frequency vs Multi Frequency Detectors • Detecting Alluvial Bench Deposits -- Pt II • The Goldfield Mining District -- Then and Now • Nevada's Lithium Boom • Old Patch, New Detector • Over The Divide: James H Harrand & Daniel Yesberger • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices