3 sentences

1. 这是一块磁铁矿。

   zhè shì yī kuài cí​tiě​kuàng.

   This is a piece of magnetite.

   Source: OpenSubtitles

2. 这里的铁矿石储量非常丰富。

   zhè​lǐ de tiě​kuàng​shí chǔ​liàng fēi​cháng fēng​fù.

   The iron ore reserves here are very abundant.

   Source: Dong Chinese Dictionary

3. 铁矿石在高温下会被熔为铁水。

   tiě kuàng​shí zài gāo​wēn xià huì bèi róng wéi tiě​shuǐ.

   Iron ore melts into molten iron at high temperatures.

   Source: Dong Chinese Dictionary