Oh yeah, it's good. "At present, the global average copper ore grades for copper mines is approximately 0.62% of Cu content, and this number is expected to decrease as mines with higher ore grades become exhausted." Calvo, G.; Mudd, G.; Valero, A.; Valero, A. Decreasing Ore Grades in Global Metallic Mining: A Theoretical Issue or a Global Reality? Resources 2016, 5, 36.
Ann: 60m @ 1% Copper at Greater Duchess, page-8
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