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    Coal mining deep underground involves a higher safety risk than coal mined in opencast pits, due primarily to problems associated with mine ventilation and the potential for mine collapse. However, there are safety risks associated with all forms of coal mining, not least because of the heavy machinery utilised in coal excavation.

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  • Appendix A Mining and Reclamation Procedures

    Mining and Reclamation Procedures Appendix A Mining and Reclamation Procedures A. GENERAL A.1 AUTHORIZATION TO MINE Since the 1970s, Peabody Western Coal Company (PWCC) has been surface mining coal in Navajo County, Arizona through coal leases located within the boundaries of the Hopi and Navajo Indian Reservations.

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    sources [3]. Text mining is a multi-disciplinary field based on information retrieval, data mining, machine learning, statistics, and computational linguistics [3]. Figure 1 shows the Venn diagram of text mining and its interaction with other fields. Several text mining techniques like summarization, classifi-

  • Anglo American production drops on coal output - MarketWatch

    Apr 25, 2019· The diversified mining company said metallurgical coal production fell to 4.2 million metric tons in the three months ended March 31, from 5.5 million tons in the year-earlier period. The ...