3 sentences

1. 这个矿区的煤炭储量非常丰富。

   zhè gè kuàng​qū de méi​tàn chǔ​liàng fēi​cháng fēng​fù.

   The coal reserves in this mining area are very abundant.

   Source: Dong Chinese Dictionary

2. 矿区每天下午都会进行爆破作业。

   kuàng​qū měi tiān xià​wǔ dōu huì jìn​xíng bào​pò zuò​yè.

   Blasting operations are carried out every afternoon in the mining area.

   Source: Dong Chinese Dictionary

3. 在旧时代的矿区，把头往往掌握着工人们的生计。

   zài jiù shí​dài de kuàng​qū, bǎ tóu wǎng​wǎng zhǎng​wò zhe gōng​rén men de shēng​jì.

   In the old days of the mining areas, labor bosses often controlled the workers' livelihoods.

   Source: Dong Chinese Dictionary