矿 has 石 stone/stone-like as the meaning part and 广 guǎng as the sound part, sharing the rhyme. It first meant metal or mineral ore, then grew to a mine where ore is dug.
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Example Sentences
这座矿山出产很多矿石。
zhèzuòkuàngshānchūchǎnhěnduōkuàngshí 。
This mine produces a lot of ores.
矿业对经济发展非常重要。
kuàngyèduìjīngjìfāzhǎnfēichángzhòngyào 。
The mining industry is very important for economic development.