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Manganese Mining E Perienced

1994-4-1The black shale facies contains several discrete chemical groupings of Mn, Fe and V in visually similar rocks. These groups are related to four thermodynamic ones based on changing pE and pH, are identified from a collection of 200 Paleooic and Mesooic finely-laminated, low-calcic Ca 0.4 black shales. The low-calcic nature of this data set permits the simplifying assumption that