实践证明t BM在硬岩地质条件下施工过程中，刀具的费用要达到机组施工成本的三分之一左右。
Practice has shown that disc cutters cost is about one-third of the total cost of TBM working, when the TBM is breaking hard rock.
通过对硬岩型铀矿坑口堆浸法的工艺流程分析，总结出坑口堆浸成本由矿石开采费用、主要原材料费用等14项要素组成，并建立了地质经济评价模型。
By analyzing the technical flow of pithead heap-leaching uranium deposits of hard-rock type, the authors analyze its 14 cost items such as ore mining fee and major materials fee etc.
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