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Carbonate and fluoride containing ores such as the LREE bastnäsite ((Ce, La, etc.)(CO 3)F) contain on average 0.1% [15] [56] yttrium compared to the 99.9% for the 16 other REEs. [56] The main source of bastnäsite from the 1960s to the 1990s was the Mountain Pass rare earth mine in California, making the United States the largest producer of ...