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this mining method involves searching for gold in ancient layers of sediment, known as alluvial deposits. these layers are composed of tiny bits of gravel, sand and minerals eroded from hard rock by moving water long ago. alluvial deposits are found in virtually every area where gold is found in
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underground mining (hard rock) underground hard rock mining refers to various underground mining techniques used to excavate, the orebody can be narrow vein such as a gold mine in the .
mining: the hard rock mining process. gold mining involves the science, technology, and business of the discovery of gold, in addition to
the geology and history of the california gold rush. the molten rock forced its way upward through the most serious problem of mining the gold veins
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posts about hard rock mining written by davidvblack