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Primary Au mineralization at Posse is hosted within felsic meta-volcanic rocks of the Proterozoic Mara Rosa volcano-sedimentary sequence. The weathered zone above ore is characterized by a degraded laterite profile dominated by a saprolitic zone above which is a stone line rich in quartz and pisoliths.More than 80% of the Au in the primary ore is present as native Au intermixed with telluride minerals...
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