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South Africa Mining Cost Open Pit Ton

2012-12-11 · Platinum-rich asteroids may contain grades of up to 100 grams per ton, 10-20 times higher than open pit platinum mines in South Africa (Sonter, 2006). ... or 1.5 times the known world reserves of platinum group metals ("Asteroid composition", 2012). Asteroid mining is a proposed approach to mining critical elements from these small bodies ...

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