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Canadian shield
The vast region of Precambrian rocks having an areal extent of 2 million square miles (5.2 million km2) in eastern Canada.
- ส่วนหนึ่งของคำพูด: noun
- อุตสาหกรรม/ขอบเขต: Mining
- Category: General mining; Mineral mining
- Government Agency: USBM
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- ed.young
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