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1. dunn bass的翻译

1. The authors take an oversize copper-mo- lybdenum deposit in North China for example, present the establishing process of the cutoff grade in polymetallic deposit, the lowest industrial grade in block section, the lowest average grade in mining area, the minimal mineable thickness and rejecting thickness of dunn bass, and point that the industrial index is a dynamic standard along with the movement of internal conditions and external circumstances in corporations, and the original industrial index can be repaired and optimized.
    以中国北方某特大型铜钼矿床为例，介绍了其多金属矿床边界品位、块段最低工业品位、矿区最低平均品位、最小可采厚度和夹石剔除厚度等工业指标的制定过程，并指出随着企业内部条件和外部环境的变化，工业指标应是一个动态的标准，可以修定和优化原有的工业指标。