h*e
2 楼
你的英文名是不是everybody is the same？
h*e
3 楼
对啊，白袜子黑猫
N*n
4 楼
Also it's hard to find higher concentration of ores after so many
years of mining. You have to dig deeper, go to politically unstable
nations you normally would not go to and work on low quality ores.
All these things are pushing the cost up.
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