Grade of ore formed from marble is higher, that formed from amphibolite is lower.

以大理岩为原岩的矿石品质优良，以斜长角闪岩为原岩的矿石品级较低。

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Mill grade of ore, recoveries and tailing grade are very correlative during dressing processes.

在选矿过程中，矿石的原矿品位、回收率、尾矿品位三者是密切相关的。

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Based on the technical and economical index, an optimal decision for the cutoff grade of ore drawing is presented.

在获取矿石技术经济指标的基础上，对截止放矿品位进行了优选政策。

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The declining grade of copper ore, a simultaneous increase in costs and political problems are other major problems facing Freeport.

FORBES: Freeport McMoran's Earnings: China Recovery, Energy Foray In Focus

Newmont attributed the lower production to the processing of lower grade ore from stockpiles as it prepared for a new phase of mining at the vast open pit in the mountains of Sumbawa.

FORBES: Newmont Mining's Rocky Year And The Way Forward

Newmont has attributed the lower production to the processing of lower grade ore from stockpiles as it prepares for a new phase of mining at the vast open pit in the mountains of Sumbawa.

FORBES: Newmont's Revised Production Forecast In Indonesia May Cause Labor Troubles