The Wassa deposit: a poly-deformed orogenic gold system in southwest Ghana - Implications for regional exploration

S. Perrouty, Mark Jessell, Y. Bourassa, John Miller, D. Apau, L. Siebenaller, G. Velásquez, L. Baratoux, L. Aillères, D. Béziat, S. Salvi

    Research output: Contribution to journalArticle

    23 Citations (Scopus)

    Abstract

    The Ashanti greenstone belt in southwest Ghana hosts many gold deposits distinguished by different timing and structural contexts. This study investigates the evolution of the Wassa system by integrating field and geophysical observations. This 4 million ounces (past production and current resources) gold deposit is interpreted to represent the oldest gold mineralization event in West Africa with gold-bearing pyrites aligned and stretched within the S1 ductile fabric. Mineralized quartz-carbonate veins were strongly deformed during the D1 deformation event. Three additional folding events are characterized by hectometer-scale tight to isoclinal folds, by a kilometer-scale synform fold centered on the mine and by a late recumbent metric-scale folds. Because of its early timing, the Wassa system represents a new poly-deformed deposit type in West Africa and highlights a potential for new discoveries in the underexplored meta-volcanic and meta-sedimentary Sefwi Group. Timing of the gold mineralization at the Wassa mine makes this deposit type a possible candidate for the source of the gold contained in the Tarkwa paleoplacer.
    Original languageEnglish
    Pages (from-to)536-547
    Number of pages12
    JournalJournal of African Earth Sciences
    Volume112
    Issue numberB
    Early online date21 Mar 2015
    DOIs
    Publication statusPublished - Dec 2015

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