Zijinshan Gold Mine is an extraordinarily large one with huge ore reserve, low grade but much better washability.

紫金山金矿是一个储量大、品位低，但可选性极佳的特大型黄金矿山。

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By using drilling in pit, ore reserve classification is increased, risks of underground mining engineering are reduced and avoided.

主要阐述了矿区通过实施坑内钻探，提高储量级别，降低和避免井下采矿工程风险，节约了成本，增加了效益。

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In order to obtain an efficient extraction to mineral resources, a method with sufficient accuracy for estimating the grade and tonnage of ore reserve is required.

有效地开采矿物资源需要对赋存的品位及矿量有一准确的估计。

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It has been estimated on the basis of the amount of indium in zinc ore stocks, there is a world reserve base of 6, 000 tonnes.

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