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exploration permit for minerals or coal exploration permits allow you to use more advanced exploration methods to determine the quantity and quality of minerals present. different exploration permits are required for minerals and for coal.
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Get Price@misc{kravits directionaldrilling, author = {stephen j. kravits and jeffrey j. schwoebel}, title = {directional drilling techniques for exploration in advance of mining}, year = {}} in seam directionally drilled horizontal boreholes have provided effective solutions in underground coal mines for
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