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Geography of the United States / Porphyry copper deposit / Butte /  Montana / Mining engineering / Mineral resource classification / Placer deposit / Mineral exploration / South Pass greenstone belt / Gold mining in the United States / Economic geology / Geology / Mining
Date: 2004-02-06 18:56:10
Geography of the United States
Porphyry copper deposit
Butte
Montana
Mining engineering
Mineral resource classification
Placer deposit
Mineral exploration
South Pass greenstone belt
Gold mining in the United States
Economic geology
Geology
Mining

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