Zijinshan Gold Mine is an extraordinarily large one with huge orereserve, 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。
2
By using drilling in pit, orereserve 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。
3
In order to obtain an efficient extraction to mineral resources, a method with sufficient accuracy for estimating the grade and tonnage of orereserve is required.