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Tuesday, December 04, 2012 11:31:17 AM
Volcanic Placer Deposits
According to the U.S. Geological Survey most of the minerals mined on Earth are associated with magmas found deep within the roots of extinct volcanoes. The heat melts the rocks and circulates the minerals, including gold, up to cooler regions where the magma solidifies instead of erupting.
The heat of the molten rock allows the trace amounts of gold and other minerals to become concentrated. When the rock cools minerals precipitate out and accumulate into ore deposits around the hardened magma
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