Even if no random event rises from a tar pit somewhere, investors say they are worried about three issues, which center on the wounded American consumer, China and the Federal Reserve.
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。
3
The ore-body block model is not only widely used in ore grade and reserve calculation, but used in the optimization of the final mining boundary and mining plan in the open pit.