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Columbite Ore Limestone

The ore zones in the Pitinga mine are related to the Madeira albite granite facies, and the main ore minerals are Garcia, 2012 1 cassiterite SnO 2, which occurs disseminated in the albite granite 2 Nb minerals, such as pyrochlore Na,REE,Ca 2 Nb 2 O 6 OH,F and columbite Fe,MnNb 2 O 6, occurring in the albite granite core and ...

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