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Gold in Jasperoid
February 2000 by Edgar B. Heylmun, PhD
Jasperoid is a jasper-like siliceous rock, in which chalcedony or cryptocrystalline quartz has replaced limestone, dolomite, or shale. It forms the gangue of many important ore bodies. It is stained by iron and manganese oxides into shades of...
Gold Hunters Hit the Web in Fight with Missile Range
A group that hunted for gold for years on Victorio Peak on this restricted southern New Mexico test range has taken its legal battle against the Army to a website.
Where to Prospect for Gold in Colorado
Colorado is one of the more productive states when it comes to gold, ranking third, behind Nevada and California. The majority of the gold deposits are confined to a northeast-trending belt known as the Colorado Mineral Belt...
Picks & Pans: Basic Dry Washing Operations in Gold Placer Mining
Some of the advantages of dry washing operations are low overhead costs (inexpensive methods and equipment), and the fact that many mining operations can be conducted by one or two individuals.
Gemstones to Die For
Some gems can potentially poison you, make you sterile and even make you forget who you are.
Lluvia de Oro— A Shower of Gold Awaiting Development in the Sierra Madre—Part I
In the silver belt of the Sierra Madre, the Lluvia de Oro was a discovery of gold, found not by the Spaniards of yore, but from an observant Indian a little over a century ago.
Mud Men: Pocket Miners of Southwest Oregon—Part I
Rocks and minerals associated with clay seam gold deposits in southern Oregon are often in sedimentary rock units at least partially metamorphosed into argillite. They are also associated with mafic volcanic rocks, basalts and gabbro that...
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The Bawl Mill
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