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File:Gold 30g for a 860kg rock.jpg

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English: Gold 30g for a 860kg rock, Toi gold mine.
日本語: 静岡県 伊豆市にある 土肥金山の金鉱石。860kgの鉱石から30gの金が採れる
Date 2007
Source Own work by uploader, Toi gold mine
Author PHGCOM

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