The mode of occurrence of manganese and its associated minerals in the manganiferous iron ore bodies of the Montreal Mine is described. It is believed that most of the manganese was contributed to the iron ore bodies by solutions of magmatic origin ascending along transverse or oblique faults from an unknown, but probably granitic, source. The manganese was apparently first deposited as rhodochrosite, subsequently altered to manganese oxides and hydroxides by calcium chloride waters which are thought to have been of juvenile derivation.

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