The setting, geometry and timing of intrusion-related hydrothermal systems in the vicinity of the Batu Hijau porphyry copper-gold deposit, Sumbawa, Indonesia

    Research output: ThesisDoctoral Thesis

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    Abstract

    [Truncated] The Batu Hijau porphyry copper-gold deposit, in southwestern Sumbawa, Indonesia, lies within a 12km by 6km region that contains several mineralized centers. Batu Hijau contains amineable reserve of 914 million tonnes at 0.53% copper and 0.40 g/t gold (4.84 million tonnes copper and 375 tonnes gold). The styles of peripheral mineral occurrences include porphyry and structurally controlled vein types.
    The Batu Hijau district consists of a gently dipping, Early to Middle Miocene andesitic volcaniclastic succession ≥ 1500m thick, which locally contains thin intercalations of limestone deposited in a fore-arc, mid-neritic paleoenvironment. The volcaniclastic succession has been cut by several phases of intrusion, which include, sequentially: three types of hypabyssal andesite (Middle to Late Miocene), at least four quartz diorite plutons (Late Miocene to mid-Pliocene), and a series of porphyritic tonalite stocks and dykes (early- to mid-Pliocene). A nandesitic diatreme and dyke complex, situated in the center of the area, post-dates these intrusions. At Teluk Puna, about 8km south of Batu Hijau, a Late Miocene, dacitic volcaniclastic sequence unconformably overlies andesitic basement rocks.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    • The University of Western Australia
    DOIs
    Publication statusUnpublished - 2000

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