Eastern Mineral and Environmental Resources Science Center
Contact: Keith Long, 520-670-5512, email@example.com
Subtask 2.1. Methods Development for Critical Mineral Designation
Subtask 2.2. Evaluation of Critical Minerals, Mainly Sources from China
Graph above, from USGS Fact Sheet 087-02, shows Global rare earth element production (1 kt=106 kg) from 1950 through 2000, in four categories: United States, almost entirely from Mountain Pass, California; China, from several deposits; all other countries combined, largely from monazite-bearing placers; and global total. Four periods of production are evident: the monazite-placer era, starting in the late 1800s and ending abruptly in 1964; the Mountain Pass era, starting in 1965 and ending about 1984; a transitional period from about 1984 to 1991; and the Chinese era, beginning about 1991.
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