Geologic grade is an important basis for appraising ore quality.

地质品位是评价矿石质量的重要依据。

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The ore quality control on the mining site is key to the ore quality control for the whole mine.

采场矿石质量管理是整个矿山矿石质量管理的核心。

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The furnaces were closed after only about a year when deteriorating ore quality forced the silver mines to shut down.

由于矿石质量下降，银矿被迫关闭，因此这些熔炉投入使用仅一年左右时间。

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We discussed the impact of this situation in our article Freeport Plagued by Lower Copper Ore Quality.

FORBES: King Copper And Go-Go Gold Carry Freeport McMoRan

The company is still dealing with the problem of low-quality ore from the mine, which forced the company to significantly reduce its copper production outlook for the year.

FORBES: Indonesian Miners Strike Another Blow For Freeport At Grasberg

Moreover, lower quality copper ore has resulted in a decline in the production levels for the company in the past.

FORBES: King Copper And Go-Go Gold Carry Freeport McMoRan