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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 employs surface and underground methods to extract coal. A number of alternative technologies are associated with each method.
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Preface: p. ix: General Mine Design Considerations: p. 1: Underground Mining Methods and Applications: p. 3: General Planning of the Noncoal Underground Mine
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