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Quartz / Placer deposit / Lode / Vein / Placer mining / Gold mining in Alaska / South Pass greenstone belt / Economic geology / Mining / Geology
Date: 2012-07-25 12:39:24
Quartz
Placer deposit
Lode
Vein
Placer mining
Gold mining in Alaska
South Pass greenstone belt
Economic geology
Mining
Geology

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