бөмбөлөгт тээрмийн дэлгэрэнгүй хэсгүүдийг diffejigs. sand and also gravel gold ores. Placer deposit Wikipedia In geology a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes The name is from the Spanish word placer meaning alluvial sand …
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