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过去几年的金属市场出现了另外一些问题，由于铜能产生持续的效益且具有很好前景，因此，现在最吸引勘探投资的金属仍然是铜．不仅铜业公司及多种矿物公司对铜表现出很大的兴趣，而且许多黄金公司也同意这样的观点，即他们年收入的30％不是来自黄金，而仍被股票市场划为黄金生
There have been other problems with the metal market over the past few years, and because of the continuing benefits and promising prospects of copper, the metal that is most attractive for exploration now remains copper. Not only are copper companies and various minerals companies showing great interest in copper, but many gold companies also agree with the view that 30% of their annual income is not derived from gold but is still classified as gold by the stock market