kuàng
variant of 礦|矿[kuang4]
石 carries the meaning: ore and minerals are found in rocky ground. 广 mainly gives the sound kuàng and does not contribute to the meaning here.
这座山下面有很多铁矿。
zhè zuò shān xià miàn yǒu hěn duō tiě kuàng。
There is a lot of iron ore beneath this mountain.
工人们每天都去矿里挖煤。
gōng rén men měi tiān dōu qù kuàng lǐ wā méi。
The workers go into the mine to dig coal every day.
金矿
jīn kuàng
gold mine
矿业
kuàng yè
mining industry
铜矿
tóng kuàng
copper mine
造岩矿物
zào yán kuàng wù
rock-forming mineral
铅矿
qiān kuàng
lead ore
采矿场
cǎi kuàng chǎng
mining area
钛铁矿
tài tiě kuàng
ilmenite FeTiO3
铝土矿
lǚ tǔ kuàng
bauxite
锡矿
xī kuàng
tin ore
锰矿
měng kuàng
manganese ore
铁矿石
tiě kuàng shí
iron ore
铁矿
tiě kuàng