铁矿石

sān jiā tiě kuàng shí shēng chǎn shāng

三家铁矿石生产商

three iron ore producers

zhè piàn kuàng mài zhōng de tiě kuàng shí píng jūn pǐn wèi gāo dá

这片矿脉中的铁矿石，平均品位高达70%。

The iron ore in this vein has an average grade of 70%.