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印尼Grasberg项目是全球第二大铜矿。
出口下滑或归咎于对Grasberg项目铜精矿减产的预期。该项目生产运转由美国自由港铜金矿公司负责，隶属于印尼国有矿商Indonesia Asahan Aluminium.
印尼能源与矿物资源部部长Yunus Saefulhak示:“由于露天开采改为地下开采，2019年该项目的铜精矿产量将下滑。”
Saefulhak补充说，今年Grasberg项目铜精矿产量预计将达120万吨左右，2018年为210万吨;而印尼国内消费量将从去年的80万吨增至100万吨。
他说，2018年Grasberg项目日均铜矿石产量为27万吨。
