5月21日 - ** 铜矿商股价上涨，追随红色金属的价格
** 伦敦金属交易所三个月期基准铜CMCU3在格林尼治标准时间1615(12:15 p.m. ET上涨0.1%，报每吨9,528美元)
** 铜价走高 (link)，因美元走软，投资者受美国债务水平不断上升的影响而寻找硬资产。
** 美元下跌，延续了两天来兑主要货币的跌势，使得绿背价格商品对持有其他货币[美元/]的买家来说价格更低。
** 在美国上市的全球矿业巨头力拓RIO.N和必和必拓集团BHP.N的股票小幅上涨
** 加拿大矿商：Hudbay Minerals HBM.TO 涨 1.8%，Ero Copper ERO.TO 涨 1.3
** 铜矿商南方铜业SCCO.N和自由港麦克莫兰FCX.N小幅上涨
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