All Articles
The Rocky Bar Mining District, Idaho
August 2010 by Alan J. Chenworth
Rocky Bar sits on the north slope of Horse Ranch Mountain, and while the most productive placers were found in Bear Creek below Rocky Bar, most of the creeks on the south, east and north sides of the mountain contain placer gold and were worked commercially in the past.The Basics of Small-Scale Heap Leaching with Cyanide Part I—History, Suitablility and Permitting
Hardrock mining is usually done on a large scale, and although a few small-scale hardrock operations still exist, it’s not an easy operation to start up and run profitably.
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.
Serpentine in California
Serpentine, as used in this article, is both a rock and a mineral. The rock should be termed "serpentinite," but the word "serpentine" is in common usage for both the rock and mineral.
Desert Bonanza
If you think all the vein gold near the surface has been dug up—think again! A weekend prospector recently came into the lab with a shoe-box full of samples that were from ten to fifty percent native crystalline gold on dirty white quartz.
Indicator Minerals for Gold & Silver
In this article, we’re going to take a look at the minerals that contain gold and silver, and how you as a prospector can identify them in the field.
Over the Divide
It is with regret that we let our readers know about the passing of four respected members of the mining and prospecting community who have been lost in the past several months.
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