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Location: 5 km SE from Maimon, Dominican Republic
El Copey-Los Martínez Highway, Km 3MaimónDominican Republic
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Perilya is owned by Zhongjin Lingnan Mining (HK) Company Limited of Hong Kong. It bought the remaining 48% of the shares that it did not already own in December 2013, and de-listed Perilya from the Australian Stock Exchange. Zhongjin Lingnan is a wholly owned subsidiary of Shenzhen Zhongjin Lingnan Nonfemet Co., Limited, China, which is 39.23% owned by the Government of the People’s Republic of China, and is listed on the Shenzhen stock exchange.
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The Cerro de Maimón deposit is a typical volcanic-hosted exhalative massive sulphide body (VMS type). It contains sulphide ores with recoverable copper, gold and silver, overlain by a gold and silver rich oxide cap.The deposit is hosted by the Maimón Formation, part of the Early Cretaceous Caribbean volcanic island arc, that trends northwest-southeast across the central part of Hispaniola. The Cerro de Maimón deposit is found within inter-bedded chlorite and sericite schists with thin beds of graphitic and siliceous exhalite. The Cerro de Maimón orebody is the largest known volcanic massive sulphide occurrence in the Maimón Formation. The original felsic volcanoclastic rocks (lapilli rhyolites and lapilli tuffs) have been metamorphosed to greenschist facies through seawater hydrothermal alteration and occur in both the hanging and the footwall to the orebody. In the hanging wall, felsic rocks are intercalated with mafic chlorite schists. Weathering of the massive sulphide has resulted in the oxide cap enriched in gold and silver.The deposit outcrops at surface, plunges southeast at 25° and dips 30° southwest. The dip flattens to 20° down plunge. It is 200 meters wide, 1,000 meters long, up to 40 meters thick near surface and narrows to 5 meters down plunge. The average thickness is approximately 12 meters.Mineralization occurs in three types: a near-surface gold/silver rich oxide cap, a supergene enriched sulphide zone, where the unaltered massive sulphide has been preferentially enriched in copper, and the unaltered massive sulphide mineralisation deeper in the deposit, below the effect of weathering and where the copper to zinc ratio approaches 1:1. The oxide cap comprises goethite enriched in gold and silver and averages 30 meters in thickness. Mineralisation in the sulphide material consists of massive to semi-massive, rounded to angular pyrite with interstitial chalcopyrite and sphalerite. Bornite, tennantite, tetrahedrite and galena occur as trace minerals. Gangue minerals include quartz, sericite, chlorite, minor calcite and barite. Secondary copper minerals, including chalcocite and covellite, partially replace the primary sulphide minerals. Supergene enrichment has locally raised the copper content to as much as 10%. Copper grades in the un-weathered sulphide mineralisation are generally between 2% and 3%.
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