The orebodies at Mt. Lyell consist of pyrite and copper sulfide lenses in deformed, chloritized and sericitized volcanic rocks of Cambrian age. The volcanic rocks are overlain unconformably by Ordovician terrestrial conglomerates that contain basal lenses of hematite overlying sulfide ores. The field relationships, mineralogy, and chemistry of the hematite bodies suggest they were gossans or limonitic screes developed during Ordovician weathering of the adjacent sulfides.

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