副矿物在矿石分类中被淘汰。

Accessory minerals are disregarded in classifying rocks.

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本文较详细地综述了难选金矿石的分类；

This paper made a detailed overview of the classification and pre-treatment of refractory gold ores.

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铁矿石必须符合一定的明确的大小分类，以符合在鼓风炉中的炼铁过程。

Iron ore must conform to a certain definite size distribution in order to be acceptable to the iron-making process in the blast-furnace.

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