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Mineral mining
The extraction of valuable minerals or other geological materials from the earth for economic interests.
Industry: Mining
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Mineral mining
戰略礦物
Mining; General mining
礦物質對國防、 供不應求的情況,在戰爭期間,我們是全部或部分依賴于外國來源,為哪些嚴格的措施控制養護和分佈是必要的。 鉻、 錫礦物、 石英晶振和雲母是舉個例子,被一些"戰略性礦產"在第二次世界大戰期間。 ...
zeophyllite
Mining; General mining
三斜晶系的礦物,Ca 4 寺 3 O 8 (哦,F) 4 .2H 2 O;pseudohexagonal ;形式白色球形,輻射狀的小葉 ;在跨 Preisen,波西米亞,捷克共和國。
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