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Gold Mining Methods Hardrock mines can be either underground mines or strip mines, and are usually more environmentally destructive than placer mining.
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Underground mining is approved out when the rocks, minerals, or gemstone are positioned at coldness far beneath the ground to be extract with outside mining.
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Coal Mining Technologies. Coal mining employs surface and underground methods to extract coal. A number of alternative technologies are associated with each method.
Underground Mining Techniques and The two main types of underground mine are named for the type of rock the There is a variety of mining methods used,
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