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1984年美国稀土生产达到创记录水平。钼公司和联合矿物有限公司是美国国内仅有的两家稀土矿物矿山生产公司。这两家公司的矿山生产1984年都大大高于1983年。美国钼公司、罗纳普朗克公司、W.R.格雷斯公司的戴维森化学分公司及努科尔公司的研究化学制品分公司是美国主要的稀土加工公司。稀土的主要用途是石油催化、冶金、玻璃陶瓷和永磁体。
In 1984, rare earth production in the United States reached a record level. Molybdenum Corporation and United Minerals Co., Ltd. are the only two rare earth mineral mining companies in the United States. The mines produced by both companies were much higher in 1984 than in 1983. Molybdenum Company of the United States, Rhône-Planck Company, Davison Chemical Branch of W. R. Grace and Nucor Corporation’s Research Chemicals Branch are the major Rare Earth companies in the United States. The main uses of rare earths are petroleum catalysis, metallurgy, glass ceramics and permanent magnets.