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我国一些矿石价值偏低的倾斜,缓倾斜中厚以下的矿床,由于赋存条件和国内技术装备的限制,又受开采成本的约束,损失贫
Due to the conditions of occurrence and the limitations of domestic technical equipment, some deposits with sloping and moderately inclined moderate thickness in China are also constrained by the cost of mining and the loss is poor