The iron deposit exposed on the crest of Bomi hill north of Monrovia, Liberia, consists of massive magnetite and hematite. The ore zone overlies granitic gneiss and is overlain locally by amphibolite gneiss and elsewhere by banded iron-rich siliceous rocks of probable sedimentary origin. Surface induration and recrystallization of the ore is attributed to the action of meteoric waters.

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