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Wikipediaの金 [wikipedia.org]によると、
1トンの鉱石から最低0.5g取れるだけで経済的に金鉱山と言えるそうです。

PC100台分の基盤を処理して、2gも取れるということは、トン当たりで見ると数十グラムも取れる計算になると思われ、
十分、掘る価値のある金山であるのではないかと。

実際、大きなスケールで事業化している例 [dowa-eco.co.jp]が有ります。

“
— 廃棄PCから純金を回収する授業、時価約1万円相当の回収に成功 | スラッシュドット・ジャパン (via plasticdreams)

へー
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