Epithermal Gold-Quartz Veins
January 2004 by Edgar B. Heylmun, PhDThe great mining geologist Waldemar Lindgren used the word “epithermal” to describe a type of quartz vein commonly found in desert regions of the United States and Mexico.
One of the oldest sayings in the mining exploration world is that if you are going to search for a new mine, one of the best places to look is near an existing, proven property.
The single most important question to be answered when evaluating a placer deposit is: “How much is it worth?” Accurate sampling of placer gravels is essential to obtain a reasonable estimate of the total gold values contained in the deposit.
How do I set up a small placer operation?
• Newmont Mining Corp.
• Manhattan Minerals Corp.
• Phelps Dodge Corp.
• Gammon Lake Resources Inc.
• Glamis Gold Ltd.
• Quadra Mining Ltd.
• Freeport-McMoRan Copper & Gold Ltd.
Within this area, about two million ounces of gold and fifty million ounces of silver have been mined. Faults, dikes, veins and fissures that carry the ore form a concentric radial pattern—like spokes on a wagon wheel—around the caldera core.
Two of the major factors affecting the profitability of a placer mining enterprise are the relative efficiency of the mining equipment, and the rate and percentage of recovery obtained while conducting mining operations.
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