2003￣2005年,美国没有对国内的稀土资源进行开采。2003年之前Moly-corp公司在加利福尼亚州Mountain Pass矿山进行氟碳铈矿((Ce,La)(CO3)F)的采掘,生产加工初级稀土产品。这时期的库存产品(包括稀土浓缩物、中间化合物以及分离的稀土氧化物),即使在2005年,还在向市场出售。美国在2005年仍是世界上最大的稀土制品的输出国,同时也是世界最大的消费国。 2003 ~ 2005, the United States did not mine the domestic rare earth resources. Prior to 2003, Moly-corp Company conducted the mining of bastnaesite ((Ce, La) (CO3) F) at the Mountain Pass mine in California to produce and process primary rare earth products. Inventory products (including rare earth concentrates, intermediate compounds, and isolated rare earth oxides) during this period were still on the market even in 2005. The United States remained the world’s largest exporter of rare earth products in 2005 and the world’s largest consumer.