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ил уурхайн олборлолт эхлэх зардал
English for Mining Engineers Surface Mining Methods Ил . Surface Mining Methods Ил олборлолтын аргууд Ил олборлолт хэд хэдэн бүлэг дэд бүлэгт хуваагддаг Тэдгээр нь Strip Opencast is used for large tabular flatlying ore bodies or mineral seams such as coal that relatively close to the surface Backfilling of
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