4 sentences

1. 这种矿的含金量非常高。

   zhè zhǒng kuàng de hán​jīn​liàng fēi​cháng gāo.

   The gold content of this ore is very high.

   Source: Dong Chinese Dictionary

2. 这个矿坑已经废弃多年了。

   zhè gè kuàng kēng yǐ​jīng fèi​qì duō nián le.

   This mine pit has been abandoned for many years.

   Source: Dong Chinese Dictionary

3. 中国拥有丰富的钨矿资源。

   Zhōng​guó yōng​yǒu fēng​fù de wū kuàng zī​yuán.

   China has abundant tungsten resources.

   Source: Dong Chinese Dictionary

4. 他在一个偏远的煤矿工作。

   tā zài yī gè piān​yuǎn de méi kuàng gōng​zuò.

   He works in a remote coal mine.

   Source: Dong Chinese Dictionary