History & Geology
Gold Depositiion and Gradients of Placer Streams—Part II
July 2012 by Jim Halloran
The steeper the gradient is, the more potential erosive power to move gold and other bedload sediments, and the more power to remove obstacles to flow.
Critical Metals: Antimony
I’ve been taking a look at the mining and uses of a number of critical metals in series of articles, and it’s time to take a look at antimony.
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.
Understanding Rock Formations: Petrology for Prospectors
There are times when being able to recognize a type of rock can make you a much more successful prospector.
Copper Deposits of Alaska
Only the famous Kennecott copper mine was able to continue operating through the Depression owing to the exceptional richness of its ore.
California: The Land of Big Nuggets—Part II
There are a number of Tertiary river channels in the area, most of which trend south-southwest. They tend to be steep, narrow, and rich with coarse gold.
Enrichment of Mineral Deposits by Weathering—Part II
While both zinc and lead deposits also are enriched by the surface weathering process, in part two we will look at the enrichment process for copper and also gold deposits, and at the interpretation of leached outcrops to figure how rich the concentrated deposits below them may be.
WSGS Releases New Geologic Maps
The Wyoming State Geological Survey announced ten new geologic maps have been completed and are now available.
Subscription Required:
The Bawl Mill
• The Life of an Independent Prospector
• Gold in Guyana—Part I: Porknocking on the Puruni River Road
• That Something Extra
• Prospecting for Copper Ores—Part II
• Metallic Trash—Scourge of the Prospector
• Gold Mining Boom in the Carolinas
• California Suction Dredging Update
• Mine, Baby, Mine!
• Hecla to Reopen Lucky Friday Mine
• Nova Scotia Shows It's Serious About Jobs & Mining
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
