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目前,由于各种近地表的矿床已经进行了大量的勘探,所以对有经济价值的矿床的勘探工作日益复杂而困难。美国摩根博士曾指出,一个公司勘探一个大型矿床要花6至10年时间,每年耗资约1.5～3百万美元。
At present, exploration of economically valuable deposits is becoming increasingly complicated and difficult due to the large amount of exploration already carried out by the various near surface deposits. Dr. Morgan of the United States once pointed out that it takes six to 10 years for a company to explore a large-scale deposit and spend about 1.5-3 million U.S. dollars annually.